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Finding the Fourth Proportional to 1,135.27, 1,702.89 and 313.55

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Solution

The fourth proportional to 1,135.27, 1,702.89 and 313.55 is: 470.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.27 : 1,702.89 = 313.55 : x
  2. Step 2: Convert to fraction form
    1,135.27/1,702.89 = 313.55/x
  3. Step 3: Cross multiply
    1,135.27x = 1,702.89 × 313.55
  4. Step 4: Simplify right side
    1,135.27x = 533,932.65
  5. Step 5: Solve for x
    x = 533,932.65/1,135.27
  6. Step 6: Final answer
    x = 470.32

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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.