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Finding the Fourth Proportional to 123,798.55, 170,842.70 and 72,813.43

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Solution

The fourth proportional to 123,798.55, 170,842.70 and 72,813.43 is: 100,482.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,798.55 : 170,842.70 = 72,813.43 : x
  2. Step 2: Convert to fraction form
    123,798.55/170,842.70 = 72,813.43/x
  3. Step 3: Cross multiply
    123,798.55x = 170,842.70 × 72,813.43
  4. Step 4: Simplify right side
    123,798.55x = 12,439,642,977.46
  5. Step 5: Solve for x
    x = 12,439,642,977.46/123,798.55
  6. Step 6: Final answer
    x = 100,482.95

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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.