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Finding the Fourth Proportional to 85,781.95, 118,377.66 and 47,019.40

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Solution

The fourth proportional to 85,781.95, 118,377.66 and 47,019.40 is: 64,885.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,781.95 : 118,377.66 = 47,019.40 : x
  2. Step 2: Convert to fraction form
    85,781.95/118,377.66 = 47,019.40/x
  3. Step 3: Cross multiply
    85,781.95x = 118,377.66 × 47,019.40
  4. Step 4: Simplify right side
    85,781.95x = 5,566,046,546.60
  5. Step 5: Solve for x
    x = 5,566,046,546.60/85,781.95
  6. Step 6: Final answer
    x = 64,885.99

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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.