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Finding the Fourth Proportional to 621.68, 857.88 and 373.19

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Solution

The fourth proportional to 621.68, 857.88 and 373.19 is: 514.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.68 : 857.88 = 373.19 : x
  2. Step 2: Convert to fraction form
    621.68/857.88 = 373.19/x
  3. Step 3: Cross multiply
    621.68x = 857.88 × 373.19
  4. Step 4: Simplify right side
    621.68x = 320,147.95
  5. Step 5: Solve for x
    x = 320,147.95/621.68
  6. Step 6: Final answer
    x = 514.98

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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.