Home / 85,520.30-128,280.45-43,384.10

Finding the Fourth Proportional to 85,520.30, 128,280.45 and 43,384.10

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Solution

The fourth proportional to 85,520.30, 128,280.45 and 43,384.10 is: 65,076.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,520.30 : 128,280.45 = 43,384.10 : x
  2. Step 2: Convert to fraction form
    85,520.30/128,280.45 = 43,384.10/x
  3. Step 3: Cross multiply
    85,520.30x = 128,280.45 × 43,384.10
  4. Step 4: Simplify right side
    85,520.30x = 5,565,331,870.85
  5. Step 5: Solve for x
    x = 5,565,331,870.85/85,520.30
  6. Step 6: Final answer
    x = 65,076.15

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Double scale
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Similar ratio
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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.