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Finding the Fourth Proportional to 1,043.38, 1,565.31 and 312.95

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Solution

The fourth proportional to 1,043.38, 1,565.31 and 312.95 is: 469.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.38 : 1,565.31 = 312.95 : x
  2. Step 2: Convert to fraction form
    1,043.38/1,565.31 = 312.95/x
  3. Step 3: Cross multiply
    1,043.38x = 1,565.31 × 312.95
  4. Step 4: Simplify right side
    1,043.38x = 489,858.29
  5. Step 5: Solve for x
    x = 489,858.29/1,043.38
  6. Step 6: Final answer
    x = 469.49

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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.