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Finding the Fourth Proportional to 1,665.40, 2,497.88 and 432.90

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Solution

The fourth proportional to 1,665.40, 2,497.88 and 432.90 is: 649.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,665.40 : 2,497.88 = 432.90 : x
  2. Step 2: Convert to fraction form
    1,665.40/2,497.88 = 432.90/x
  3. Step 3: Cross multiply
    1,665.40x = 2,497.88 × 432.90
  4. Step 4: Simplify right side
    1,665.40x = 1,081,319.76
  5. Step 5: Solve for x
    x = 1,081,319.76/1,665.40
  6. Step 6: Final answer
    x = 649.29

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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.