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Finding the Fourth Proportional to 134,691.84, 185,915.52 and 78,117.12

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Solution

The fourth proportional to 134,691.84, 185,915.52 and 78,117.12 is: 107,825.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    134,691.84 : 185,915.52 = 78,117.12 : x
  2. Step 2: Convert to fraction form
    134,691.84/185,915.52 = 78,117.12/x
  3. Step 3: Cross multiply
    134,691.84x = 185,915.52 × 78,117.12
  4. Step 4: Simplify right side
    134,691.84x = 14,523,184,985.70
  5. Step 5: Solve for x
    x = 14,523,184,985.70/134,691.84
  6. Step 6: Final answer
    x = 107,825.28

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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.