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Finding the Fourth Proportional to 1,125.86, 1,689.56 and 395.45

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Solution

The fourth proportional to 1,125.86, 1,689.56 and 395.45 is: 593.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.86 : 1,689.56 = 395.45 : x
  2. Step 2: Convert to fraction form
    1,125.86/1,689.56 = 395.45/x
  3. Step 3: Cross multiply
    1,125.86x = 1,689.56 × 395.45
  4. Step 4: Simplify right side
    1,125.86x = 668,136.50
  5. Step 5: Solve for x
    x = 668,136.50/1,125.86
  6. Step 6: Final answer
    x = 593.45

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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.