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Finding the Fourth Proportional to 872.60, 1,309.10 and 256.29

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Solution

The fourth proportional to 872.60, 1,309.10 and 256.29 is: 384.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.60 : 1,309.10 = 256.29 : x
  2. Step 2: Convert to fraction form
    872.60/1,309.10 = 256.29/x
  3. Step 3: Cross multiply
    872.60x = 1,309.10 × 256.29
  4. Step 4: Simplify right side
    872.60x = 335,509.24
  5. Step 5: Solve for x
    x = 335,509.24/872.60
  6. Step 6: Final answer
    x = 384.49

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1.5x scale

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.