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Finding the Fourth Proportional to 623.39, 860.17 and 387.40

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Solution

The fourth proportional to 623.39, 860.17 and 387.40 is: 534.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.39 : 860.17 = 387.40 : x
  2. Step 2: Convert to fraction form
    623.39/860.17 = 387.40/x
  3. Step 3: Cross multiply
    623.39x = 860.17 × 387.40
  4. Step 4: Simplify right side
    623.39x = 333,227.92
  5. Step 5: Solve for x
    x = 333,227.92/623.39
  6. Step 6: Final answer
    x = 534.54

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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.