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Finding the Fourth Proportional to 1,138.26, 1,707.45 and 316.53

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Solution

The fourth proportional to 1,138.26, 1,707.45 and 316.53 is: 474.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.26 : 1,707.45 = 316.53 : x
  2. Step 2: Convert to fraction form
    1,138.26/1,707.45 = 316.53/x
  3. Step 3: Cross multiply
    1,138.26x = 1,707.45 × 316.53
  4. Step 4: Simplify right side
    1,138.26x = 540,459.15
  5. Step 5: Solve for x
    x = 540,459.15/1,138.26
  6. Step 6: Final answer
    x = 474.81

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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.