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Finding the Fourth Proportional to 708.87, 1,061.02 and 378.98

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Solution

The fourth proportional to 708.87, 1,061.02 and 378.98 is: 567.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.87 : 1,061.02 = 378.98 : x
  2. Step 2: Convert to fraction form
    708.87/1,061.02 = 378.98/x
  3. Step 3: Cross multiply
    708.87x = 1,061.02 × 378.98
  4. Step 4: Simplify right side
    708.87x = 402,107.02
  5. Step 5: Solve for x
    x = 402,107.02/708.87
  6. Step 6: Final answer
    x = 567.25

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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.