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Finding the Fourth Proportional to 717.55, 1,075.86 and 306.57

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Solution

The fourth proportional to 717.55, 1,075.86 and 306.57 is: 459.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.55 : 1,075.86 = 306.57 : x
  2. Step 2: Convert to fraction form
    717.55/1,075.86 = 306.57/x
  3. Step 3: Cross multiply
    717.55x = 1,075.86 × 306.57
  4. Step 4: Simplify right side
    717.55x = 329,826.40
  5. Step 5: Solve for x
    x = 329,826.40/717.55
  6. Step 6: Final answer
    x = 459.66

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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.