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Finding the Fourth Proportional to 718.65, 1,078.47 and 426.06

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Solution

The fourth proportional to 718.65, 1,078.47 and 426.06 is: 639.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.65 : 1,078.47 = 426.06 : x
  2. Step 2: Convert to fraction form
    718.65/1,078.47 = 426.06/x
  3. Step 3: Cross multiply
    718.65x = 1,078.47 × 426.06
  4. Step 4: Simplify right side
    718.65x = 459,492.93
  5. Step 5: Solve for x
    x = 459,492.93/718.65
  6. Step 6: Final answer
    x = 639.38

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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.