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Finding the Fourth Proportional to 423,839.70, 635,689.62 and 139,534.02

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Solution

The fourth proportional to 423,839.70, 635,689.62 and 139,534.02 is: 209,278.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,839.70 : 635,689.62 = 139,534.02 : x
  2. Step 2: Convert to fraction form
    423,839.70/635,689.62 = 139,534.02/x
  3. Step 3: Cross multiply
    423,839.70x = 635,689.62 × 139,534.02
  4. Step 4: Simplify right side
    423,839.70x = 88,700,328,150.87
  5. Step 5: Solve for x
    x = 88,700,328,150.87/423,839.70
  6. Step 6: Final answer
    x = 209,278.01

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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.