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Finding the Fourth Proportional to 85,881.80, 128,458.20 and 77,060.90

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Solution

The fourth proportional to 85,881.80, 128,458.20 and 77,060.90 is: 115,264.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,881.80 : 128,458.20 = 77,060.90 : x
  2. Step 2: Convert to fraction form
    85,881.80/128,458.20 = 77,060.90/x
  3. Step 3: Cross multiply
    85,881.80x = 128,458.20 × 77,060.90
  4. Step 4: Simplify right side
    85,881.80x = 9,899,104,504.38
  5. Step 5: Solve for x
    x = 9,899,104,504.38/85,881.80
  6. Step 6: Final answer
    x = 115,264.29

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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.