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Finding the Fourth Proportional to 1,240.71, 1,861.34 and 375

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Solution

The fourth proportional to 1,240.71, 1,861.34 and 375 is: 562.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.71 : 1,861.34 = 375 : x
  2. Step 2: Convert to fraction form
    1,240.71/1,861.34 = 375/x
  3. Step 3: Cross multiply
    1,240.71x = 1,861.34 × 375
  4. Step 4: Simplify right side
    1,240.71x = 698,000.63
  5. Step 5: Solve for x
    x = 698,000.63/1,240.71
  6. Step 6: Final answer
    x = 562.58

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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.