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Finding the Fourth Proportional to 78,479.92, 108,302.56 and 42,670.08

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Solution

The fourth proportional to 78,479.92, 108,302.56 and 42,670.08 is: 58,884.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,479.92 : 108,302.56 = 42,670.08 : x
  2. Step 2: Convert to fraction form
    78,479.92/108,302.56 = 42,670.08/x
  3. Step 3: Cross multiply
    78,479.92x = 108,302.56 × 42,670.08
  4. Step 4: Simplify right side
    78,479.92x = 4,621,278,899.40
  5. Step 5: Solve for x
    x = 4,621,278,899.40/78,479.92
  6. Step 6: Final answer
    x = 58,884.86

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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.