Home / 1,247.13-1,870.70-381.38

Finding the Fourth Proportional to 1,247.13, 1,870.70 and 381.38

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Solution

The fourth proportional to 1,247.13, 1,870.70 and 381.38 is: 572.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.13 : 1,870.70 = 381.38 : x
  2. Step 2: Convert to fraction form
    1,247.13/1,870.70 = 381.38/x
  3. Step 3: Cross multiply
    1,247.13x = 1,870.70 × 381.38
  4. Step 4: Simplify right side
    1,247.13x = 713,436.31
  5. Step 5: Solve for x
    x = 713,436.31/1,247.13
  6. Step 6: Final answer
    x = 572.06

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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.