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Finding the Fourth Proportional to 1,009.94, 1,515.38 and 316.71

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Solution

The fourth proportional to 1,009.94, 1,515.38 and 316.71 is: 475.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.94 : 1,515.38 = 316.71 : x
  2. Step 2: Convert to fraction form
    1,009.94/1,515.38 = 316.71/x
  3. Step 3: Cross multiply
    1,009.94x = 1,515.38 × 316.71
  4. Step 4: Simplify right side
    1,009.94x = 479,934.42
  5. Step 5: Solve for x
    x = 479,934.42/1,009.94
  6. Step 6: Final answer
    x = 475.21

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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.