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Finding the Fourth Proportional to 78,668.88, 108,565.56 and 42,860.04

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Solution

The fourth proportional to 78,668.88, 108,565.56 and 42,860.04 is: 59,148.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,668.88 : 108,565.56 = 42,860.04 : x
  2. Step 2: Convert to fraction form
    78,668.88/108,565.56 = 42,860.04/x
  3. Step 3: Cross multiply
    78,668.88x = 108,565.56 × 42,860.04
  4. Step 4: Simplify right side
    78,668.88x = 4,653,124,244.22
  5. Step 5: Solve for x
    x = 4,653,124,244.22/78,668.88
  6. Step 6: Final answer
    x = 59,148.22

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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.