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Finding the Fourth Proportional to 910.69, 1,256.75 and 496.69

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Solution

The fourth proportional to 910.69, 1,256.75 and 496.69 is: 685.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.69 : 1,256.75 = 496.69 : x
  2. Step 2: Convert to fraction form
    910.69/1,256.75 = 496.69/x
  3. Step 3: Cross multiply
    910.69x = 1,256.75 × 496.69
  4. Step 4: Simplify right side
    910.69x = 624,211.39
  5. Step 5: Solve for x
    x = 624,211.39/910.69
  6. Step 6: Final answer
    x = 685.43

Related Problems

Find fourth proportional to 455.34, 628.37 and 248.34
Half scale
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Double scale
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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.