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Finding the Fourth Proportional to 717.20, 1,075.80 and 230.40

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Solution

The fourth proportional to 717.20, 1,075.80 and 230.40 is: 345.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.20 : 1,075.80 = 230.40 : x
  2. Step 2: Convert to fraction form
    717.20/1,075.80 = 230.40/x
  3. Step 3: Cross multiply
    717.20x = 1,075.80 × 230.40
  4. Step 4: Simplify right side
    717.20x = 247,864.32
  5. Step 5: Solve for x
    x = 247,864.32/717.20
  6. Step 6: Final answer
    x = 345.60

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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.