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Finding the Fourth Proportional to 85,660.40, 128,490.60 and 57,666.80

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Solution

The fourth proportional to 85,660.40, 128,490.60 and 57,666.80 is: 86,500.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,660.40 : 128,490.60 = 57,666.80 : x
  2. Step 2: Convert to fraction form
    85,660.40/128,490.60 = 57,666.80/x
  3. Step 3: Cross multiply
    85,660.40x = 128,490.60 × 57,666.80
  4. Step 4: Simplify right side
    85,660.40x = 7,409,641,732.08
  5. Step 5: Solve for x
    x = 7,409,641,732.08/85,660.40
  6. Step 6: Final answer
    x = 86,500.20

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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.