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Finding the Fourth Proportional to 709.15, 1,062.79 and 380.05

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Solution

The fourth proportional to 709.15, 1,062.79 and 380.05 is: 569.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.15 : 1,062.79 = 380.05 : x
  2. Step 2: Convert to fraction form
    709.15/1,062.79 = 380.05/x
  3. Step 3: Cross multiply
    709.15x = 1,062.79 × 380.05
  4. Step 4: Simplify right side
    709.15x = 403,913.34
  5. Step 5: Solve for x
    x = 403,913.34/709.15
  6. Step 6: Final answer
    x = 569.57

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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.