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Finding the Fourth Proportional to 671.18, 1,006.78 and 346.20

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Solution

The fourth proportional to 671.18, 1,006.78 and 346.20 is: 519.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.18 : 1,006.78 = 346.20 : x
  2. Step 2: Convert to fraction form
    671.18/1,006.78 = 346.20/x
  3. Step 3: Cross multiply
    671.18x = 1,006.78 × 346.20
  4. Step 4: Simplify right side
    671.18x = 348,547.24
  5. Step 5: Solve for x
    x = 348,547.24/671.18
  6. Step 6: Final answer
    x = 519.31

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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.