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Finding the Fourth Proportional to 709.80, 1,064.10 and 385.40

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Solution

The fourth proportional to 709.80, 1,064.10 and 385.40 is: 577.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.80 : 1,064.10 = 385.40 : x
  2. Step 2: Convert to fraction form
    709.80/1,064.10 = 385.40/x
  3. Step 3: Cross multiply
    709.80x = 1,064.10 × 385.40
  4. Step 4: Simplify right side
    709.80x = 410,104.14
  5. Step 5: Solve for x
    x = 410,104.14/709.80
  6. Step 6: Final answer
    x = 577.77

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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.