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Finding the Fourth Proportional to 753.38, 1,039.71 and 491.39

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Solution

The fourth proportional to 753.38, 1,039.71 and 491.39 is: 678.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.38 : 1,039.71 = 491.39 : x
  2. Step 2: Convert to fraction form
    753.38/1,039.71 = 491.39/x
  3. Step 3: Cross multiply
    753.38x = 1,039.71 × 491.39
  4. Step 4: Simplify right side
    753.38x = 510,903.10
  5. Step 5: Solve for x
    x = 510,903.10/753.38
  6. Step 6: Final answer
    x = 678.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.