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Finding the Fourth Proportional to 1,011.25, 1,515.63 and 718.29

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Solution

The fourth proportional to 1,011.25, 1,515.63 and 718.29 is: 1,076.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.25 : 1,515.63 = 718.29 : x
  2. Step 2: Convert to fraction form
    1,011.25/1,515.63 = 718.29/x
  3. Step 3: Cross multiply
    1,011.25x = 1,515.63 × 718.29
  4. Step 4: Simplify right side
    1,011.25x = 1,088,661.87
  5. Step 5: Solve for x
    x = 1,088,661.87/1,011.25
  6. Step 6: Final answer
    x = 1,076.55

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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.