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Finding the Fourth Proportional to 19,988.84, 29,981.82 and 8,892.20

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Solution

The fourth proportional to 19,988.84, 29,981.82 and 8,892.20 is: 13,337.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,988.84 : 29,981.82 = 8,892.20 : x
  2. Step 2: Convert to fraction form
    19,988.84/29,981.82 = 8,892.20/x
  3. Step 3: Cross multiply
    19,988.84x = 29,981.82 × 8,892.20
  4. Step 4: Simplify right side
    19,988.84x = 266,604,339.80
  5. Step 5: Solve for x
    x = 266,604,339.80/19,988.84
  6. Step 6: Final answer
    x = 13,337.66

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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.