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Finding the Fourth Proportional to 717.23, 989.61 and 520.40

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Solution

The fourth proportional to 717.23, 989.61 and 520.40 is: 718.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.23 : 989.61 = 520.40 : x
  2. Step 2: Convert to fraction form
    717.23/989.61 = 520.40/x
  3. Step 3: Cross multiply
    717.23x = 989.61 × 520.40
  4. Step 4: Simplify right side
    717.23x = 514,993.04
  5. Step 5: Solve for x
    x = 514,993.04/717.23
  6. Step 6: Final answer
    x = 718.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.