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Finding the Fourth Proportional to 718.58, 1,078.20 and 353.63

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Solution

The fourth proportional to 718.58, 1,078.20 and 353.63 is: 530.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.58 : 1,078.20 = 353.63 : x
  2. Step 2: Convert to fraction form
    718.58/1,078.20 = 353.63/x
  3. Step 3: Cross multiply
    718.58x = 1,078.20 × 353.63
  4. Step 4: Simplify right side
    718.58x = 381,283.87
  5. Step 5: Solve for x
    x = 381,283.87/718.58
  6. Step 6: Final answer
    x = 530.61

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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.