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Finding the Fourth Proportional to 85,948.80, 129,020.40 and 66,314.40

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Solution

The fourth proportional to 85,948.80, 129,020.40 and 66,314.40 is: 99,546.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,948.80 : 129,020.40 = 66,314.40 : x
  2. Step 2: Convert to fraction form
    85,948.80/129,020.40 = 66,314.40/x
  3. Step 3: Cross multiply
    85,948.80x = 129,020.40 × 66,314.40
  4. Step 4: Simplify right side
    85,948.80x = 8,555,910,413.76
  5. Step 5: Solve for x
    x = 8,555,910,413.76/85,948.80
  6. Step 6: Final answer
    x = 99,546.60

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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.