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Finding the Fourth Proportional to 872.32, 1,202.07 and 623.20

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Solution

The fourth proportional to 872.32, 1,202.07 and 623.20 is: 858.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.32 : 1,202.07 = 623.20 : x
  2. Step 2: Convert to fraction form
    872.32/1,202.07 = 623.20/x
  3. Step 3: Cross multiply
    872.32x = 1,202.07 × 623.20
  4. Step 4: Simplify right side
    872.32x = 749,130.02
  5. Step 5: Solve for x
    x = 749,130.02/872.32
  6. Step 6: Final answer
    x = 858.78

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1.5x scale

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.