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Finding the Fourth Proportional to 48,687.60, 72,679.19 and 42,782.70

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Solution

The fourth proportional to 48,687.60, 72,679.19 and 42,782.70 is: 63,864.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,687.60 : 72,679.19 = 42,782.70 : x
  2. Step 2: Convert to fraction form
    48,687.60/72,679.19 = 42,782.70/x
  3. Step 3: Cross multiply
    48,687.60x = 72,679.19 × 42,782.70
  4. Step 4: Simplify right side
    48,687.60x = 3,109,411,768.10
  5. Step 5: Solve for x
    x = 3,109,411,768.10/48,687.60
  6. Step 6: Final answer
    x = 63,864.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.