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Finding the Fourth Proportional to 711.29, 1,065.71 and 555.42

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Solution

The fourth proportional to 711.29, 1,065.71 and 555.42 is: 832.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.29 : 1,065.71 = 555.42 : x
  2. Step 2: Convert to fraction form
    711.29/1,065.71 = 555.42/x
  3. Step 3: Cross multiply
    711.29x = 1,065.71 × 555.42
  4. Step 4: Simplify right side
    711.29x = 591,913.87
  5. Step 5: Solve for x
    x = 591,913.87/711.29
  6. Step 6: Final answer
    x = 832.18

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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.