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Finding the Fourth Proportional to 671.68, 1,005.90 and 346.06

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Solution

The fourth proportional to 671.68, 1,005.90 and 346.06 is: 518.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.68 : 1,005.90 = 346.06 : x
  2. Step 2: Convert to fraction form
    671.68/1,005.90 = 346.06/x
  3. Step 3: Cross multiply
    671.68x = 1,005.90 × 346.06
  4. Step 4: Simplify right side
    671.68x = 348,101.75
  5. Step 5: Solve for x
    x = 348,101.75/671.68
  6. Step 6: Final answer
    x = 518.26

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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.