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Finding the Fourth Proportional to 78,299.80, 117,449.36 and 28,368.20

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Solution

The fourth proportional to 78,299.80, 117,449.36 and 28,368.20 is: 42,552.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,299.80 : 117,449.36 = 28,368.20 : x
  2. Step 2: Convert to fraction form
    78,299.80/117,449.36 = 28,368.20/x
  3. Step 3: Cross multiply
    78,299.80x = 117,449.36 × 28,368.20
  4. Step 4: Simplify right side
    78,299.80x = 3,331,826,934.35
  5. Step 5: Solve for x
    x = 3,331,826,934.35/78,299.80
  6. Step 6: Final answer
    x = 42,552.18

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1.5x scale

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.