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Finding the Fourth Proportional to 718.47, 1,077.70 and 205.47

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Solution

The fourth proportional to 718.47, 1,077.70 and 205.47 is: 308.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.47 : 1,077.70 = 205.47 : x
  2. Step 2: Convert to fraction form
    718.47/1,077.70 = 205.47/x
  3. Step 3: Cross multiply
    718.47x = 1,077.70 × 205.47
  4. Step 4: Simplify right side
    718.47x = 221,429.12
  5. Step 5: Solve for x
    x = 221,429.12/718.47
  6. Step 6: Final answer
    x = 308.20

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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.