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Finding the Fourth Proportional to 1,010.51, 1,515.75 and 317.18

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Solution

The fourth proportional to 1,010.51, 1,515.75 and 317.18 is: 475.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.51 : 1,515.75 = 317.18 : x
  2. Step 2: Convert to fraction form
    1,010.51/1,515.75 = 317.18/x
  3. Step 3: Cross multiply
    1,010.51x = 1,515.75 × 317.18
  4. Step 4: Simplify right side
    1,010.51x = 480,758.01
  5. Step 5: Solve for x
    x = 480,758.01/1,010.51
  6. Step 6: Final answer
    x = 475.76

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Double scale
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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.