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Finding the Fourth Proportional to 85,847.80, 128,407.20 and 77,026.90

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Solution

The fourth proportional to 85,847.80, 128,407.20 and 77,026.90 is: 115,213.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,847.80 : 128,407.20 = 77,026.90 : x
  2. Step 2: Convert to fraction form
    85,847.80/128,407.20 = 77,026.90/x
  3. Step 3: Cross multiply
    85,847.80x = 128,407.20 × 77,026.90
  4. Step 4: Simplify right side
    85,847.80x = 9,890,808,553.68
  5. Step 5: Solve for x
    x = 9,890,808,553.68/85,847.80
  6. Step 6: Final answer
    x = 115,213.30

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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.