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Finding the Fourth Proportional to 718.43, 990.15 and 618.59

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Solution

The fourth proportional to 718.43, 990.15 and 618.59 is: 852.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.43 : 990.15 = 618.59 : x
  2. Step 2: Convert to fraction form
    718.43/990.15 = 618.59/x
  3. Step 3: Cross multiply
    718.43x = 990.15 × 618.59
  4. Step 4: Simplify right side
    718.43x = 612,495.50
  5. Step 5: Solve for x
    x = 612,495.50/718.43
  6. Step 6: Final answer
    x = 852.55

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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.