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Finding the Fourth Proportional to 1,320.61, 1,981.02 and 443.12

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Solution

The fourth proportional to 1,320.61, 1,981.02 and 443.12 is: 664.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.61 : 1,981.02 = 443.12 : x
  2. Step 2: Convert to fraction form
    1,320.61/1,981.02 = 443.12/x
  3. Step 3: Cross multiply
    1,320.61x = 1,981.02 × 443.12
  4. Step 4: Simplify right side
    1,320.61x = 877,829.58
  5. Step 5: Solve for x
    x = 877,829.58/1,320.61
  6. Step 6: Final answer
    x = 664.72

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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.