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Finding the Fourth Proportional to 92,720.40, 138,947.40 and 57,639.60

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Solution

The fourth proportional to 92,720.40, 138,947.40 and 57,639.60 is: 86,376.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,720.40 : 138,947.40 = 57,639.60 : x
  2. Step 2: Convert to fraction form
    92,720.40/138,947.40 = 57,639.60/x
  3. Step 3: Cross multiply
    92,720.40x = 138,947.40 × 57,639.60
  4. Step 4: Simplify right side
    92,720.40x = 8,008,872,557.04
  5. Step 5: Solve for x
    x = 8,008,872,557.04/92,720.40
  6. Step 6: Final answer
    x = 86,376.60

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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.