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Finding the Fourth Proportional to 616.86, 851.57 and 421.40

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Solution

The fourth proportional to 616.86, 851.57 and 421.40 is: 581.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.86 : 851.57 = 421.40 : x
  2. Step 2: Convert to fraction form
    616.86/851.57 = 421.40/x
  3. Step 3: Cross multiply
    616.86x = 851.57 × 421.40
  4. Step 4: Simplify right side
    616.86x = 358,851.60
  5. Step 5: Solve for x
    x = 358,851.60/616.86
  6. Step 6: Final answer
    x = 581.74

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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.