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Finding the Fourth Proportional to 581.18, 872.06 and 386.31

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Solution

The fourth proportional to 581.18, 872.06 and 386.31 is: 579.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.18 : 872.06 = 386.31 : x
  2. Step 2: Convert to fraction form
    581.18/872.06 = 386.31/x
  3. Step 3: Cross multiply
    581.18x = 872.06 × 386.31
  4. Step 4: Simplify right side
    581.18x = 336,885.50
  5. Step 5: Solve for x
    x = 336,885.50/581.18
  6. Step 6: Final answer
    x = 579.66

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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.