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Finding the Fourth Proportional to 78,479.52, 117,719.28 and 55,210.08

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Solution

The fourth proportional to 78,479.52, 117,719.28 and 55,210.08 is: 82,815.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,479.52 : 117,719.28 = 55,210.08 : x
  2. Step 2: Convert to fraction form
    78,479.52/117,719.28 = 55,210.08/x
  3. Step 3: Cross multiply
    78,479.52x = 117,719.28 × 55,210.08
  4. Step 4: Simplify right side
    78,479.52x = 6,499,290,866.34
  5. Step 5: Solve for x
    x = 6,499,290,866.34/78,479.52
  6. Step 6: Final answer
    x = 82,815.12

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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.