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Finding the Fourth Proportional to 1,134.80, 1,702.20 and 313.05

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Solution

The fourth proportional to 1,134.80, 1,702.20 and 313.05 is: 469.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,134.80 : 1,702.20 = 313.05 : x
  2. Step 2: Convert to fraction form
    1,134.80/1,702.20 = 313.05/x
  3. Step 3: Cross multiply
    1,134.80x = 1,702.20 × 313.05
  4. Step 4: Simplify right side
    1,134.80x = 532,873.71
  5. Step 5: Solve for x
    x = 532,873.71/1,134.80
  6. Step 6: Final answer
    x = 469.58

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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.