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Finding the Fourth Proportional to 85,660.40, 128,498.70 and 23,330.90

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Solution

The fourth proportional to 85,660.40, 128,498.70 and 23,330.90 is: 34,998.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,660.40 : 128,498.70 = 23,330.90 : x
  2. Step 2: Convert to fraction form
    85,660.40/128,498.70 = 23,330.90/x
  3. Step 3: Cross multiply
    85,660.40x = 128,498.70 × 23,330.90
  4. Step 4: Simplify right side
    85,660.40x = 2,997,990,319.83
  5. Step 5: Solve for x
    x = 2,997,990,319.83/85,660.40
  6. Step 6: Final answer
    x = 34,998.56

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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.