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Finding the Fourth Proportional to 711.68, 1,068.36 and 387.68

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Solution

The fourth proportional to 711.68, 1,068.36 and 387.68 is: 581.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.68 : 1,068.36 = 387.68 : x
  2. Step 2: Convert to fraction form
    711.68/1,068.36 = 387.68/x
  3. Step 3: Cross multiply
    711.68x = 1,068.36 × 387.68
  4. Step 4: Simplify right side
    711.68x = 414,181.80
  5. Step 5: Solve for x
    x = 414,181.80/711.68
  6. Step 6: Final answer
    x = 581.98

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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.