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Finding the Fourth Proportional to 711.45, 1,066.05 and 385.83

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Solution

The fourth proportional to 711.45, 1,066.05 and 385.83 is: 578.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.45 : 1,066.05 = 385.83 : x
  2. Step 2: Convert to fraction form
    711.45/1,066.05 = 385.83/x
  3. Step 3: Cross multiply
    711.45x = 1,066.05 × 385.83
  4. Step 4: Simplify right side
    711.45x = 411,314.07
  5. Step 5: Solve for x
    x = 411,314.07/711.45
  6. Step 6: Final answer
    x = 578.13

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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.