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Finding the Fourth Proportional to 719.66, 992.73 and 498.74

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Solution

The fourth proportional to 719.66, 992.73 and 498.74 is: 687.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.66 : 992.73 = 498.74 : x
  2. Step 2: Convert to fraction form
    719.66/992.73 = 498.74/x
  3. Step 3: Cross multiply
    719.66x = 992.73 × 498.74
  4. Step 4: Simplify right side
    719.66x = 495,114.16
  5. Step 5: Solve for x
    x = 495,114.16/719.66
  6. Step 6: Final answer
    x = 687.98

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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.