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Finding the Fourth Proportional to 717.23, 1,074.95 and 388.17

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Solution

The fourth proportional to 717.23, 1,074.95 and 388.17 is: 581.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.23 : 1,074.95 = 388.17 : x
  2. Step 2: Convert to fraction form
    717.23/1,074.95 = 388.17/x
  3. Step 3: Cross multiply
    717.23x = 1,074.95 × 388.17
  4. Step 4: Simplify right side
    717.23x = 417,258.74
  5. Step 5: Solve for x
    x = 417,258.74/717.23
  6. Step 6: Final answer
    x = 581.76

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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.