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Finding the Fourth Proportional to 711.40, 1,065.66 and 454.36

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Solution

The fourth proportional to 711.40, 1,065.66 and 454.36 is: 680.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.40 : 1,065.66 = 454.36 : x
  2. Step 2: Convert to fraction form
    711.40/1,065.66 = 454.36/x
  3. Step 3: Cross multiply
    711.40x = 1,065.66 × 454.36
  4. Step 4: Simplify right side
    711.40x = 484,193.28
  5. Step 5: Solve for x
    x = 484,193.28/711.40
  6. Step 6: Final answer
    x = 680.62

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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.