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Finding the Fourth Proportional to 927.15, 1,390.64 and 342.12

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Solution

The fourth proportional to 927.15, 1,390.64 and 342.12 is: 513.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.15 : 1,390.64 = 342.12 : x
  2. Step 2: Convert to fraction form
    927.15/1,390.64 = 342.12/x
  3. Step 3: Cross multiply
    927.15x = 1,390.64 × 342.12
  4. Step 4: Simplify right side
    927.15x = 475,772.15
  5. Step 5: Solve for x
    x = 475,772.15/927.15
  6. Step 6: Final answer
    x = 513.16

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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.