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Finding the Fourth Proportional to 1,247.30, 1,870.93 and 381.62

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Solution

The fourth proportional to 1,247.30, 1,870.93 and 381.62 is: 572.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.30 : 1,870.93 = 381.62 : x
  2. Step 2: Convert to fraction form
    1,247.30/1,870.93 = 381.62/x
  3. Step 3: Cross multiply
    1,247.30x = 1,870.93 × 381.62
  4. Step 4: Simplify right side
    1,247.30x = 713,984.31
  5. Step 5: Solve for x
    x = 713,984.31/1,247.30
  6. Step 6: Final answer
    x = 572.42

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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.