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Finding the Fourth Proportional to 72,988.29, 109,491.75 and 20,398.23

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Solution

The fourth proportional to 72,988.29, 109,491.75 and 20,398.23 is: 30,599.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,988.29 : 109,491.75 = 20,398.23 : x
  2. Step 2: Convert to fraction form
    72,988.29/109,491.75 = 20,398.23/x
  3. Step 3: Cross multiply
    72,988.29x = 109,491.75 × 20,398.23
  4. Step 4: Simplify right side
    72,988.29x = 2,233,437,899.60
  5. Step 5: Solve for x
    x = 2,233,437,899.60/72,988.29
  6. Step 6: Final answer
    x = 30,599.95

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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.