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Finding the Fourth Proportional to 621.48, 857.60 and 372.72

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Solution

The fourth proportional to 621.48, 857.60 and 372.72 is: 514.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.48 : 857.60 = 372.72 : x
  2. Step 2: Convert to fraction form
    621.48/857.60 = 372.72/x
  3. Step 3: Cross multiply
    621.48x = 857.60 × 372.72
  4. Step 4: Simplify right side
    621.48x = 319,644.67
  5. Step 5: Solve for x
    x = 319,644.67/621.48
  6. Step 6: Final answer
    x = 514.33

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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.