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Finding the Fourth Proportional to 1,247.01, 1,870.89 and 553.85

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Solution

The fourth proportional to 1,247.01, 1,870.89 and 553.85 is: 830.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.01 : 1,870.89 = 553.85 : x
  2. Step 2: Convert to fraction form
    1,247.01/1,870.89 = 553.85/x
  3. Step 3: Cross multiply
    1,247.01x = 1,870.89 × 553.85
  4. Step 4: Simplify right side
    1,247.01x = 1,036,192.43
  5. Step 5: Solve for x
    x = 1,036,192.43/1,247.01
  6. Step 6: Final answer
    x = 830.94

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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.