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Finding the Fourth Proportional to 78,658.88, 108,549.28 and 42,848.90

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Solution

The fourth proportional to 78,658.88, 108,549.28 and 42,848.90 is: 59,131.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,658.88 : 108,549.28 = 42,848.90 : x
  2. Step 2: Convert to fraction form
    78,658.88/108,549.28 = 42,848.90/x
  3. Step 3: Cross multiply
    78,658.88x = 108,549.28 × 42,848.90
  4. Step 4: Simplify right side
    78,658.88x = 4,651,217,243.79
  5. Step 5: Solve for x
    x = 4,651,217,243.79/78,658.88
  6. Step 6: Final answer
    x = 59,131.50

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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.