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Finding the Fourth Proportional to 621.76, 858.39 and 412.22

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Solution

The fourth proportional to 621.76, 858.39 and 412.22 is: 569.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.76 : 858.39 = 412.22 : x
  2. Step 2: Convert to fraction form
    621.76/858.39 = 412.22/x
  3. Step 3: Cross multiply
    621.76x = 858.39 × 412.22
  4. Step 4: Simplify right side
    621.76x = 353,849.92
  5. Step 5: Solve for x
    x = 353,849.92/621.76
  6. Step 6: Final answer
    x = 569.11

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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.