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Finding the Fourth Proportional to 86,019.20, 128,737.20 and 75,521.60

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Solution

The fourth proportional to 86,019.20, 128,737.20 and 75,521.60 is: 113,026.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,019.20 : 128,737.20 = 75,521.60 : x
  2. Step 2: Convert to fraction form
    86,019.20/128,737.20 = 75,521.60/x
  3. Step 3: Cross multiply
    86,019.20x = 128,737.20 × 75,521.60
  4. Step 4: Simplify right side
    86,019.20x = 9,722,439,323.52
  5. Step 5: Solve for x
    x = 9,722,439,323.52/86,019.20
  6. Step 6: Final answer
    x = 113,026.39

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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.