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Finding the Fourth Proportional to 78,809.14, 108,655.56 and 57,281.20

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Solution

The fourth proportional to 78,809.14, 108,655.56 and 57,281.20 is: 78,974.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,809.14 : 108,655.56 = 57,281.20 : x
  2. Step 2: Convert to fraction form
    78,809.14/108,655.56 = 57,281.20/x
  3. Step 3: Cross multiply
    78,809.14x = 108,655.56 × 57,281.20
  4. Step 4: Simplify right side
    78,809.14x = 6,223,920,863.47
  5. Step 5: Solve for x
    x = 6,223,920,863.47/78,809.14
  6. Step 6: Final answer
    x = 78,974.61

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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.