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Finding the Fourth Proportional to 1,282.86, 1,931.13 and 991.91

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Solution

The fourth proportional to 1,282.86, 1,931.13 and 991.91 is: 1,493.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.86 : 1,931.13 = 991.91 : x
  2. Step 2: Convert to fraction form
    1,282.86/1,931.13 = 991.91/x
  3. Step 3: Cross multiply
    1,282.86x = 1,931.13 × 991.91
  4. Step 4: Simplify right side
    1,282.86x = 1,915,511.99
  5. Step 5: Solve for x
    x = 1,915,511.99/1,282.86
  6. Step 6: Final answer
    x = 1,493.16

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.