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Finding the Fourth Proportional to 1,146.71, 1,715.95 and 993.16

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Solution

The fourth proportional to 1,146.71, 1,715.95 and 993.16 is: 1,486.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,146.71 : 1,715.95 = 993.16 : x
  2. Step 2: Convert to fraction form
    1,146.71/1,715.95 = 993.16/x
  3. Step 3: Cross multiply
    1,146.71x = 1,715.95 × 993.16
  4. Step 4: Simplify right side
    1,146.71x = 1,704,212.90
  5. Step 5: Solve for x
    x = 1,704,212.90/1,146.71
  6. Step 6: Final answer
    x = 1,486.18

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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.