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Finding the Fourth Proportional to 456.40, 683.70 and 424.72

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Solution

The fourth proportional to 456.40, 683.70 and 424.72 is: 636.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.40 : 683.70 = 424.72 : x
  2. Step 2: Convert to fraction form
    456.40/683.70 = 424.72/x
  3. Step 3: Cross multiply
    456.40x = 683.70 × 424.72
  4. Step 4: Simplify right side
    456.40x = 290,381.06
  5. Step 5: Solve for x
    x = 290,381.06/456.40
  6. Step 6: Final answer
    x = 636.24

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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.