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Finding the Fourth Proportional to 714.38, 1,065.80 and 636.47

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Solution

The fourth proportional to 714.38, 1,065.80 and 636.47 is: 949.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.38 : 1,065.80 = 636.47 : x
  2. Step 2: Convert to fraction form
    714.38/1,065.80 = 636.47/x
  3. Step 3: Cross multiply
    714.38x = 1,065.80 × 636.47
  4. Step 4: Simplify right side
    714.38x = 678,347.01
  5. Step 5: Solve for x
    x = 678,347.01/714.38
  6. Step 6: Final answer
    x = 949.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.