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Finding the Fourth Proportional to 1,009.70, 1,512.90 and 392.70

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Solution

The fourth proportional to 1,009.70, 1,512.90 and 392.70 is: 588.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.70 : 1,512.90 = 392.70 : x
  2. Step 2: Convert to fraction form
    1,009.70/1,512.90 = 392.70/x
  3. Step 3: Cross multiply
    1,009.70x = 1,512.90 × 392.70
  4. Step 4: Simplify right side
    1,009.70x = 594,115.83
  5. Step 5: Solve for x
    x = 594,115.83/1,009.70
  6. Step 6: Final answer
    x = 588.41

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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.