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Finding the Fourth Proportional to 891.22, 1,230.78 and 612.16

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Solution

The fourth proportional to 891.22, 1,230.78 and 612.16 is: 845.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.22 : 1,230.78 = 612.16 : x
  2. Step 2: Convert to fraction form
    891.22/1,230.78 = 612.16/x
  3. Step 3: Cross multiply
    891.22x = 1,230.78 × 612.16
  4. Step 4: Simplify right side
    891.22x = 753,430.06
  5. Step 5: Solve for x
    x = 753,430.06/891.22
  6. Step 6: Final answer
    x = 845.39

Related Problems

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Half scale
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Double scale
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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.