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Finding the Fourth Proportional to 725.19, 1,001.06 and 515.40

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Solution

The fourth proportional to 725.19, 1,001.06 and 515.40 is: 711.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.19 : 1,001.06 = 515.40 : x
  2. Step 2: Convert to fraction form
    725.19/1,001.06 = 515.40/x
  3. Step 3: Cross multiply
    725.19x = 1,001.06 × 515.40
  4. Step 4: Simplify right side
    725.19x = 515,946.32
  5. Step 5: Solve for x
    x = 515,946.32/725.19
  6. Step 6: Final answer
    x = 711.46

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.