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Finding the Fourth Proportional to 1,115.19, 1,672.21 and 374.55

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Solution

The fourth proportional to 1,115.19, 1,672.21 and 374.55 is: 561.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.19 : 1,672.21 = 374.55 : x
  2. Step 2: Convert to fraction form
    1,115.19/1,672.21 = 374.55/x
  3. Step 3: Cross multiply
    1,115.19x = 1,672.21 × 374.55
  4. Step 4: Simplify right side
    1,115.19x = 626,326.26
  5. Step 5: Solve for x
    x = 626,326.26/1,115.19
  6. Step 6: Final answer
    x = 561.63

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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.