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Finding the Fourth Proportional to 671.18, 926.30 and 391.40

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Solution

The fourth proportional to 671.18, 926.30 and 391.40 is: 540.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.18 : 926.30 = 391.40 : x
  2. Step 2: Convert to fraction form
    671.18/926.30 = 391.40/x
  3. Step 3: Cross multiply
    671.18x = 926.30 × 391.40
  4. Step 4: Simplify right side
    671.18x = 362,547.23
  5. Step 5: Solve for x
    x = 362,547.23/671.18
  6. Step 6: Final answer
    x = 540.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.