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Finding the Fourth Proportional to 718.50, 988.95 and 613.26

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Solution

The fourth proportional to 718.50, 988.95 and 613.26 is: 844.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.50 : 988.95 = 613.26 : x
  2. Step 2: Convert to fraction form
    718.50/988.95 = 613.26/x
  3. Step 3: Cross multiply
    718.50x = 988.95 × 613.26
  4. Step 4: Simplify right side
    718.50x = 606,483.48
  5. Step 5: Solve for x
    x = 606,483.48/718.50
  6. Step 6: Final answer
    x = 844.10

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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.