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Finding the Fourth Proportional to 623.91, 860.22 and 476.31

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Solution

The fourth proportional to 623.91, 860.22 and 476.31 is: 656.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.91 : 860.22 = 476.31 : x
  2. Step 2: Convert to fraction form
    623.91/860.22 = 476.31/x
  3. Step 3: Cross multiply
    623.91x = 860.22 × 476.31
  4. Step 4: Simplify right side
    623.91x = 409,731.39
  5. Step 5: Solve for x
    x = 409,731.39/623.91
  6. Step 6: Final answer
    x = 656.72

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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.