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Finding the Fourth Proportional to 423,138.64, 634,710.12 and 142,658.32

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Solution

The fourth proportional to 423,138.64, 634,710.12 and 142,658.32 is: 213,988.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,138.64 : 634,710.12 = 142,658.32 : x
  2. Step 2: Convert to fraction form
    423,138.64/634,710.12 = 142,658.32/x
  3. Step 3: Cross multiply
    423,138.64x = 634,710.12 × 142,658.32
  4. Step 4: Simplify right side
    423,138.64x = 90,546,679,406.20
  5. Step 5: Solve for x
    x = 90,546,679,406.20/423,138.64
  6. Step 6: Final answer
    x = 213,988.21

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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.