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Finding the Fourth Proportional to 238,899.80, 358,405.12 and 81,128.40

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Solution

The fourth proportional to 238,899.80, 358,405.12 and 81,128.40 is: 121,711.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    238,899.80 : 358,405.12 = 81,128.40 : x
  2. Step 2: Convert to fraction form
    238,899.80/358,405.12 = 81,128.40/x
  3. Step 3: Cross multiply
    238,899.80x = 358,405.12 × 81,128.40
  4. Step 4: Simplify right side
    238,899.80x = 29,076,833,937.41
  5. Step 5: Solve for x
    x = 29,076,833,937.41/238,899.80
  6. Step 6: Final answer
    x = 121,711.42

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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.