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Finding the Fourth Proportional to 927.66, 1,390.76 and 465.20

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Solution

The fourth proportional to 927.66, 1,390.76 and 465.20 is: 697.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.66 : 1,390.76 = 465.20 : x
  2. Step 2: Convert to fraction form
    927.66/1,390.76 = 465.20/x
  3. Step 3: Cross multiply
    927.66x = 1,390.76 × 465.20
  4. Step 4: Simplify right side
    927.66x = 646,972.27
  5. Step 5: Solve for x
    x = 646,972.27/927.66
  6. Step 6: Final answer
    x = 697.42

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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.