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Finding the Fourth Proportional to 718.18, 988.41 and 630.70

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Solution

The fourth proportional to 718.18, 988.41 and 630.70 is: 868.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.18 : 988.41 = 630.70 : x
  2. Step 2: Convert to fraction form
    718.18/988.41 = 630.70/x
  3. Step 3: Cross multiply
    718.18x = 988.41 × 630.70
  4. Step 4: Simplify right side
    718.18x = 623,390.19
  5. Step 5: Solve for x
    x = 623,390.19/718.18
  6. Step 6: Final answer
    x = 868.01

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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.