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Finding the Fourth Proportional to 718.11, 1,068.56 and 715.68

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Solution

The fourth proportional to 718.11, 1,068.56 and 715.68 is: 1,064.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.11 : 1,068.56 = 715.68 : x
  2. Step 2: Convert to fraction form
    718.11/1,068.56 = 715.68/x
  3. Step 3: Cross multiply
    718.11x = 1,068.56 × 715.68
  4. Step 4: Simplify right side
    718.11x = 764,747.02
  5. Step 5: Solve for x
    x = 764,747.02/718.11
  6. Step 6: Final answer
    x = 1,064.94

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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.