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Finding the Fourth Proportional to 1,010.38, 1,515.14 and 316.88

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Solution

The fourth proportional to 1,010.38, 1,515.14 and 316.88 is: 475.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.38 : 1,515.14 = 316.88 : x
  2. Step 2: Convert to fraction form
    1,010.38/1,515.14 = 316.88/x
  3. Step 3: Cross multiply
    1,010.38x = 1,515.14 × 316.88
  4. Step 4: Simplify right side
    1,010.38x = 480,117.56
  5. Step 5: Solve for x
    x = 480,117.56/1,010.38
  6. Step 6: Final answer
    x = 475.19

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1.5x scale

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.