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Finding the Fourth Proportional to 98,443.78, 135,805.14 and 64,437.28

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Solution

The fourth proportional to 98,443.78, 135,805.14 and 64,437.28 is: 88,892.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,443.78 : 135,805.14 = 64,437.28 : x
  2. Step 2: Convert to fraction form
    98,443.78/135,805.14 = 64,437.28/x
  3. Step 3: Cross multiply
    98,443.78x = 135,805.14 × 64,437.28
  4. Step 4: Simplify right side
    98,443.78x = 8,750,913,492.11
  5. Step 5: Solve for x
    x = 8,750,913,492.11/98,443.78
  6. Step 6: Final answer
    x = 88,892.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.