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Finding the Fourth Proportional to 709.68, 1,065.78 and 493.68

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Solution

The fourth proportional to 709.68, 1,065.78 and 493.68 is: 741.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.68 : 1,065.78 = 493.68 : x
  2. Step 2: Convert to fraction form
    709.68/1,065.78 = 493.68/x
  3. Step 3: Cross multiply
    709.68x = 1,065.78 × 493.68
  4. Step 4: Simplify right side
    709.68x = 526,154.27
  5. Step 5: Solve for x
    x = 526,154.27/709.68
  6. Step 6: Final answer
    x = 741.40

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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.