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Finding the Fourth Proportional to 1,247.47, 1,871.21 and 553.95

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Solution

The fourth proportional to 1,247.47, 1,871.21 and 553.95 is: 830.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.47 : 1,871.21 = 553.95 : x
  2. Step 2: Convert to fraction form
    1,247.47/1,871.21 = 553.95/x
  3. Step 3: Cross multiply
    1,247.47x = 1,871.21 × 553.95
  4. Step 4: Simplify right side
    1,247.47x = 1,036,558.16
  5. Step 5: Solve for x
    x = 1,036,558.16/1,247.47
  6. Step 6: Final answer
    x = 830.93

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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.