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Finding the Fourth Proportional to 1,115.55, 1,674.14 and 385.74

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Solution

The fourth proportional to 1,115.55, 1,674.14 and 385.74 is: 578.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.55 : 1,674.14 = 385.74 : x
  2. Step 2: Convert to fraction form
    1,115.55/1,674.14 = 385.74/x
  3. Step 3: Cross multiply
    1,115.55x = 1,674.14 × 385.74
  4. Step 4: Simplify right side
    1,115.55x = 645,780.83
  5. Step 5: Solve for x
    x = 645,780.83/1,115.55
  6. Step 6: Final answer
    x = 578.89

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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.