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Finding the Fourth Proportional to 718.66, 1,078.26 and 430.30

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Solution

The fourth proportional to 718.66, 1,078.26 and 430.30 is: 645.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.66 : 1,078.26 = 430.30 : x
  2. Step 2: Convert to fraction form
    718.66/1,078.26 = 430.30/x
  3. Step 3: Cross multiply
    718.66x = 1,078.26 × 430.30
  4. Step 4: Simplify right side
    718.66x = 463,975.28
  5. Step 5: Solve for x
    x = 463,975.28/718.66
  6. Step 6: Final answer
    x = 645.61

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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.