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Finding the Fourth Proportional to 1,009.26, 1,513.47 and 315.69

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Solution

The fourth proportional to 1,009.26, 1,513.47 and 315.69 is: 473.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.26 : 1,513.47 = 315.69 : x
  2. Step 2: Convert to fraction form
    1,009.26/1,513.47 = 315.69/x
  3. Step 3: Cross multiply
    1,009.26x = 1,513.47 × 315.69
  4. Step 4: Simplify right side
    1,009.26x = 477,787.34
  5. Step 5: Solve for x
    x = 477,787.34/1,009.26
  6. Step 6: Final answer
    x = 473.40

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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.