Home / 85,521.20-128,195.40-38,807.60

Finding the Fourth Proportional to 85,521.20, 128,195.40 and 38,807.60

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Solution

The fourth proportional to 85,521.20, 128,195.40 and 38,807.60 is: 58,172.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,521.20 : 128,195.40 = 38,807.60 : x
  2. Step 2: Convert to fraction form
    85,521.20/128,195.40 = 38,807.60/x
  3. Step 3: Cross multiply
    85,521.20x = 128,195.40 × 38,807.60
  4. Step 4: Simplify right side
    85,521.20x = 4,974,955,805.04
  5. Step 5: Solve for x
    x = 4,974,955,805.04/85,521.20
  6. Step 6: Final answer
    x = 58,172.19

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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.