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Finding the Fourth Proportional to 910.89, 1,256.26 and 612.19

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Solution

The fourth proportional to 910.89, 1,256.26 and 612.19 is: 844.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.89 : 1,256.26 = 612.19 : x
  2. Step 2: Convert to fraction form
    910.89/1,256.26 = 612.19/x
  3. Step 3: Cross multiply
    910.89x = 1,256.26 × 612.19
  4. Step 4: Simplify right side
    910.89x = 769,069.81
  5. Step 5: Solve for x
    x = 769,069.81/910.89
  6. Step 6: Final answer
    x = 844.31

Related Problems

Find fourth proportional to 455.45, 628.13 and 306.10
Half scale
Find fourth proportional to 1,821.78, 2,512.52 and 1,224.38
Double scale
Find fourth proportional to 911.89, 1,257.64 and 613.19
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.