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Finding the Fourth Proportional to 718.79, 1,078.94 and 637.05

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Solution

The fourth proportional to 718.79, 1,078.94 and 637.05 is: 956.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.79 : 1,078.94 = 637.05 : x
  2. Step 2: Convert to fraction form
    718.79/1,078.94 = 637.05/x
  3. Step 3: Cross multiply
    718.79x = 1,078.94 × 637.05
  4. Step 4: Simplify right side
    718.79x = 687,335.23
  5. Step 5: Solve for x
    x = 687,335.23/718.79
  6. Step 6: Final answer
    x = 956.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.