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Finding the Fourth Proportional to 621.72, 858.24 and 435.24

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Solution

The fourth proportional to 621.72, 858.24 and 435.24 is: 600.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.72 : 858.24 = 435.24 : x
  2. Step 2: Convert to fraction form
    621.72/858.24 = 435.24/x
  3. Step 3: Cross multiply
    621.72x = 858.24 × 435.24
  4. Step 4: Simplify right side
    621.72x = 373,540.38
  5. Step 5: Solve for x
    x = 373,540.38/621.72
  6. Step 6: Final answer
    x = 600.82

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Double scale
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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.