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Finding the Fourth Proportional to 91,985.70, 137,978.55 and 84,987.30

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Solution

The fourth proportional to 91,985.70, 137,978.55 and 84,987.30 is: 127,480.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,985.70 : 137,978.55 = 84,987.30 : x
  2. Step 2: Convert to fraction form
    91,985.70/137,978.55 = 84,987.30/x
  3. Step 3: Cross multiply
    91,985.70x = 137,978.55 × 84,987.30
  4. Step 4: Simplify right side
    91,985.70x = 11,726,424,422.42
  5. Step 5: Solve for x
    x = 11,726,424,422.42/91,985.70
  6. Step 6: Final answer
    x = 127,480.95

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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.