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Finding the Fourth Proportional to 71,981.55, 100,642.95 and 71,981.55

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Solution

The fourth proportional to 71,981.55, 100,642.95 and 71,981.55 is: 100,642.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,981.55 : 100,642.95 = 71,981.55 : x
  2. Step 2: Convert to fraction form
    71,981.55/100,642.95 = 71,981.55/x
  3. Step 3: Cross multiply
    71,981.55x = 100,642.95 × 71,981.55
  4. Step 4: Simplify right side
    71,981.55x = 7,244,435,537.57
  5. Step 5: Solve for x
    x = 7,244,435,537.57/71,981.55
  6. Step 6: Final answer
    x = 100,642.95

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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.