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Finding the Fourth Proportional to 423,140.64, 634,713.12 and 142,660.32

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Solution

The fourth proportional to 423,140.64, 634,713.12 and 142,660.32 is: 213,991.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,140.64 : 634,713.12 = 142,660.32 : x
  2. Step 2: Convert to fraction form
    423,140.64/634,713.12 = 142,660.32/x
  3. Step 3: Cross multiply
    423,140.64x = 634,713.12 × 142,660.32
  4. Step 4: Simplify right side
    423,140.64x = 90,548,376,807.40
  5. Step 5: Solve for x
    x = 90,548,376,807.40/423,140.64
  6. Step 6: Final answer
    x = 213,991.21

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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.