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Finding the Fourth Proportional to 52,460.80, 78,710.40 and 21,299.20

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Solution

The fourth proportional to 52,460.80, 78,710.40 and 21,299.20 is: 31,956.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,460.80 : 78,710.40 = 21,299.20 : x
  2. Step 2: Convert to fraction form
    52,460.80/78,710.40 = 21,299.20/x
  3. Step 3: Cross multiply
    52,460.80x = 78,710.40 × 21,299.20
  4. Step 4: Simplify right side
    52,460.80x = 1,676,468,551.68
  5. Step 5: Solve for x
    x = 1,676,468,551.68/52,460.80
  6. Step 6: Final answer
    x = 31,956.60

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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.