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Finding the Fourth Proportional to 718.76, 991.90 and 403.98

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Solution

The fourth proportional to 718.76, 991.90 and 403.98 is: 557.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.76 : 991.90 = 403.98 : x
  2. Step 2: Convert to fraction form
    718.76/991.90 = 403.98/x
  3. Step 3: Cross multiply
    718.76x = 991.90 × 403.98
  4. Step 4: Simplify right side
    718.76x = 400,707.76
  5. Step 5: Solve for x
    x = 400,707.76/718.76
  6. Step 6: Final answer
    x = 557.50

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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.