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Finding the Fourth Proportional to 581.02, 870.90 and 256

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Solution

The fourth proportional to 581.02, 870.90 and 256 is: 383.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    581.02 : 870.90 = 256 : x
  2. Step 2: Convert to fraction form
    581.02/870.90 = 256/x
  3. Step 3: Cross multiply
    581.02x = 870.90 × 256
  4. Step 4: Simplify right side
    581.02x = 222,950.40
  5. Step 5: Solve for x
    x = 222,950.40/581.02
  6. Step 6: Final answer
    x = 383.72

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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.