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Finding the Fourth Proportional to 28,712.60, 42,947.40 and 25,772.30

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Solution

The fourth proportional to 28,712.60, 42,947.40 and 25,772.30 is: 38,549.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,712.60 : 42,947.40 = 25,772.30 : x
  2. Step 2: Convert to fraction form
    28,712.60/42,947.40 = 25,772.30/x
  3. Step 3: Cross multiply
    28,712.60x = 42,947.40 × 25,772.30
  4. Step 4: Simplify right side
    28,712.60x = 1,106,853,277.02
  5. Step 5: Solve for x
    x = 1,106,853,277.02/28,712.60
  6. Step 6: Final answer
    x = 38,549.39

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1.5x scale

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.