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Finding the Fourth Proportional to 459.40, 689.10 and 424.30

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Solution

The fourth proportional to 459.40, 689.10 and 424.30 is: 636.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.40 : 689.10 = 424.30 : x
  2. Step 2: Convert to fraction form
    459.40/689.10 = 424.30/x
  3. Step 3: Cross multiply
    459.40x = 689.10 × 424.30
  4. Step 4: Simplify right side
    459.40x = 292,385.13
  5. Step 5: Solve for x
    x = 292,385.13/459.40
  6. Step 6: Final answer
    x = 636.45

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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.