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Finding the Fourth Proportional to 91,812.30, 137,718.45 and 80,148.30

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Solution

The fourth proportional to 91,812.30, 137,718.45 and 80,148.30 is: 120,222.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,812.30 : 137,718.45 = 80,148.30 : x
  2. Step 2: Convert to fraction form
    91,812.30/137,718.45 = 80,148.30/x
  3. Step 3: Cross multiply
    91,812.30x = 137,718.45 × 80,148.30
  4. Step 4: Simplify right side
    91,812.30x = 11,037,899,646.14
  5. Step 5: Solve for x
    x = 11,037,899,646.14/91,812.30
  6. Step 6: Final answer
    x = 120,222.45

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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.