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Finding the Fourth Proportional to 92,978.71, 128,363.35 and 71,133.92

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Solution

The fourth proportional to 92,978.71, 128,363.35 and 71,133.92 is: 98,205.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,978.71 : 128,363.35 = 71,133.92 : x
  2. Step 2: Convert to fraction form
    92,978.71/128,363.35 = 71,133.92/x
  3. Step 3: Cross multiply
    92,978.71x = 128,363.35 × 71,133.92
  4. Step 4: Simplify right side
    92,978.71x = 9,130,988,125.84
  5. Step 5: Solve for x
    x = 9,130,988,125.84/92,978.71
  6. Step 6: Final answer
    x = 98,205.15

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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.