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Finding the Fourth Proportional to 91,737.20, 128,155.60 and 91,737.20

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Solution

The fourth proportional to 91,737.20, 128,155.60 and 91,737.20 is: 128,155.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,737.20 : 128,155.60 = 91,737.20 : x
  2. Step 2: Convert to fraction form
    91,737.20/128,155.60 = 91,737.20/x
  3. Step 3: Cross multiply
    91,737.20x = 128,155.60 × 91,737.20
  4. Step 4: Simplify right side
    91,737.20x = 11,756,635,908.32
  5. Step 5: Solve for x
    x = 11,756,635,908.32/91,737.20
  6. Step 6: Final answer
    x = 128,155.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.