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Finding the Fourth Proportional to 78,648.50, 108,534.93 and 45,125.30

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Solution

The fourth proportional to 78,648.50, 108,534.93 and 45,125.30 is: 62,272.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,648.50 : 108,534.93 = 45,125.30 : x
  2. Step 2: Convert to fraction form
    78,648.50/108,534.93 = 45,125.30/x
  3. Step 3: Cross multiply
    78,648.50x = 108,534.93 × 45,125.30
  4. Step 4: Simplify right side
    78,648.50x = 4,897,671,276.73
  5. Step 5: Solve for x
    x = 4,897,671,276.73/78,648.50
  6. Step 6: Final answer
    x = 62,272.91

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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.