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Finding the Fourth Proportional to 718.61, 990.43 and 552.45

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Solution

The fourth proportional to 718.61, 990.43 and 552.45 is: 761.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.61 : 990.43 = 552.45 : x
  2. Step 2: Convert to fraction form
    718.61/990.43 = 552.45/x
  3. Step 3: Cross multiply
    718.61x = 990.43 × 552.45
  4. Step 4: Simplify right side
    718.61x = 547,165.39
  5. Step 5: Solve for x
    x = 547,165.39/718.61
  6. Step 6: Final answer
    x = 761.43

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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.