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Finding the Fourth Proportional to 85,876.80, 128,450.70 and 77,055.90

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Solution

The fourth proportional to 85,876.80, 128,450.70 and 77,055.90 is: 115,256.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,876.80 : 128,450.70 = 77,055.90 : x
  2. Step 2: Convert to fraction form
    85,876.80/128,450.70 = 77,055.90/x
  3. Step 3: Cross multiply
    85,876.80x = 128,450.70 × 77,055.90
  4. Step 4: Simplify right side
    85,876.80x = 9,897,884,294.13
  5. Step 5: Solve for x
    x = 9,897,884,294.13/85,876.80
  6. Step 6: Final answer
    x = 115,256.79

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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.