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Finding the Fourth Proportional to 581.06, 870.69 and 215.75

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Solution

The fourth proportional to 581.06, 870.69 and 215.75 is: 323.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.06 : 870.69 = 215.75 : x
  2. Step 2: Convert to fraction form
    581.06/870.69 = 215.75/x
  3. Step 3: Cross multiply
    581.06x = 870.69 × 215.75
  4. Step 4: Simplify right side
    581.06x = 187,851.37
  5. Step 5: Solve for x
    x = 187,851.37/581.06
  6. Step 6: Final answer
    x = 323.29

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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.