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Finding the Fourth Proportional to 92,710.40, 138,721.12 and 55,290.83

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Solution

The fourth proportional to 92,710.40, 138,721.12 and 55,290.83 is: 82,730.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,710.40 : 138,721.12 = 55,290.83 : x
  2. Step 2: Convert to fraction form
    92,710.40/138,721.12 = 55,290.83/x
  3. Step 3: Cross multiply
    92,710.40x = 138,721.12 × 55,290.83
  4. Step 4: Simplify right side
    92,710.40x = 7,670,005,031.50
  5. Step 5: Solve for x
    x = 7,670,005,031.50/92,710.40
  6. Step 6: Final answer
    x = 82,730.80

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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.