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Finding the Fourth Proportional to 927.12, 1,389.50 and 378.66

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Solution

The fourth proportional to 927.12, 1,389.50 and 378.66 is: 567.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.12 : 1,389.50 = 378.66 : x
  2. Step 2: Convert to fraction form
    927.12/1,389.50 = 378.66/x
  3. Step 3: Cross multiply
    927.12x = 1,389.50 × 378.66
  4. Step 4: Simplify right side
    927.12x = 526,148.07
  5. Step 5: Solve for x
    x = 526,148.07/927.12
  6. Step 6: Final answer
    x = 567.51

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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.