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Finding the Fourth Proportional to 61,079.28, 84,288.24 and 39,818.40

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Solution

The fourth proportional to 61,079.28, 84,288.24 and 39,818.40 is: 54,948.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,079.28 : 84,288.24 = 39,818.40 : x
  2. Step 2: Convert to fraction form
    61,079.28/84,288.24 = 39,818.40/x
  3. Step 3: Cross multiply
    61,079.28x = 84,288.24 × 39,818.40
  4. Step 4: Simplify right side
    61,079.28x = 3,356,222,855.62
  5. Step 5: Solve for x
    x = 3,356,222,855.62/61,079.28
  6. Step 6: Final answer
    x = 54,948.63

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1.5x scale

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.