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Finding the Fourth Proportional to 1,282.72, 1,925.02 and 990.95

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Solution

The fourth proportional to 1,282.72, 1,925.02 and 990.95 is: 1,487.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.72 : 1,925.02 = 990.95 : x
  2. Step 2: Convert to fraction form
    1,282.72/1,925.02 = 990.95/x
  3. Step 3: Cross multiply
    1,282.72x = 1,925.02 × 990.95
  4. Step 4: Simplify right side
    1,282.72x = 1,907,595.44
  5. Step 5: Solve for x
    x = 1,907,595.44/1,282.72
  6. Step 6: Final answer
    x = 1,487.15

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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.