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Finding the Fourth Proportional to 1,135.20, 1,702.90 and 313.48

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Solution

The fourth proportional to 1,135.20, 1,702.90 and 313.48 is: 470.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.20 : 1,702.90 = 313.48 : x
  2. Step 2: Convert to fraction form
    1,135.20/1,702.90 = 313.48/x
  3. Step 3: Cross multiply
    1,135.20x = 1,702.90 × 313.48
  4. Step 4: Simplify right side
    1,135.20x = 533,825.09
  5. Step 5: Solve for x
    x = 533,825.09/1,135.20
  6. Step 6: Final answer
    x = 470.25

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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.