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Finding the Fourth Proportional to 123,423.68, 170,330.88 and 72,438.62

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Solution

The fourth proportional to 123,423.68, 170,330.88 and 72,438.62 is: 99,968.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,423.68 : 170,330.88 = 72,438.62 : x
  2. Step 2: Convert to fraction form
    123,423.68/170,330.88 = 72,438.62/x
  3. Step 3: Cross multiply
    123,423.68x = 170,330.88 × 72,438.62
  4. Step 4: Simplify right side
    123,423.68x = 12,338,533,890.59
  5. Step 5: Solve for x
    x = 12,338,533,890.59/123,423.68
  6. Step 6: Final answer
    x = 99,968.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.