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Finding the Fourth Proportional to 713.55, 1,068.30 and 640.65

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Solution

The fourth proportional to 713.55, 1,068.30 and 640.65 is: 959.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.55 : 1,068.30 = 640.65 : x
  2. Step 2: Convert to fraction form
    713.55/1,068.30 = 640.65/x
  3. Step 3: Cross multiply
    713.55x = 1,068.30 × 640.65
  4. Step 4: Simplify right side
    713.55x = 684,406.40
  5. Step 5: Solve for x
    x = 684,406.40/713.55
  6. Step 6: Final answer
    x = 959.16

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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.