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Finding the Fourth Proportional to 621.09, 931.23 and 456.53

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Solution

The fourth proportional to 621.09, 931.23 and 456.53 is: 684.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.09 : 931.23 = 456.53 : x
  2. Step 2: Convert to fraction form
    621.09/931.23 = 456.53/x
  3. Step 3: Cross multiply
    621.09x = 931.23 × 456.53
  4. Step 4: Simplify right side
    621.09x = 425,129.78
  5. Step 5: Solve for x
    x = 425,129.78/621.09
  6. Step 6: Final answer
    x = 684.49

Related Problems

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.