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Finding the Fourth Proportional to 714.65, 1,069.09 and 618.19

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Solution

The fourth proportional to 714.65, 1,069.09 and 618.19 is: 924.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.65 : 1,069.09 = 618.19 : x
  2. Step 2: Convert to fraction form
    714.65/1,069.09 = 618.19/x
  3. Step 3: Cross multiply
    714.65x = 1,069.09 × 618.19
  4. Step 4: Simplify right side
    714.65x = 660,896.53
  5. Step 5: Solve for x
    x = 660,896.53/714.65
  6. Step 6: Final answer
    x = 924.79

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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.