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Finding the Fourth Proportional to 92,978.08, 128,371.54 and 71,429.44

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Solution

The fourth proportional to 92,978.08, 128,371.54 and 71,429.44 is: 98,620.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,978.08 : 128,371.54 = 71,429.44 : x
  2. Step 2: Convert to fraction form
    92,978.08/128,371.54 = 71,429.44/x
  3. Step 3: Cross multiply
    92,978.08x = 128,371.54 × 71,429.44
  4. Step 4: Simplify right side
    92,978.08x = 9,169,506,856.99
  5. Step 5: Solve for x
    x = 9,169,506,856.99/92,978.08
  6. Step 6: Final answer
    x = 98,620.10

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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.