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Finding the Fourth Proportional to 938.10, 1,295.10 and 623.79

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Solution

The fourth proportional to 938.10, 1,295.10 and 623.79 is: 861.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.10 : 1,295.10 = 623.79 : x
  2. Step 2: Convert to fraction form
    938.10/1,295.10 = 623.79/x
  3. Step 3: Cross multiply
    938.10x = 1,295.10 × 623.79
  4. Step 4: Simplify right side
    938.10x = 807,870.43
  5. Step 5: Solve for x
    x = 807,870.43/938.10
  6. Step 6: Final answer
    x = 861.18

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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.