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Finding the Fourth Proportional to 85,777.80, 128,666.70 and 80,966.40

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Solution

The fourth proportional to 85,777.80, 128,666.70 and 80,966.40 is: 121,449.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,777.80 : 128,666.70 = 80,966.40 : x
  2. Step 2: Convert to fraction form
    85,777.80/128,666.70 = 80,966.40/x
  3. Step 3: Cross multiply
    85,777.80x = 128,666.70 × 80,966.40
  4. Step 4: Simplify right side
    85,777.80x = 10,417,679,498.88
  5. Step 5: Solve for x
    x = 10,417,679,498.88/85,777.80
  6. Step 6: Final answer
    x = 121,449.60

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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.