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Finding the Fourth Proportional to 942.39, 1,300.92 and 628.21

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Solution

The fourth proportional to 942.39, 1,300.92 and 628.21 is: 867.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.39 : 1,300.92 = 628.21 : x
  2. Step 2: Convert to fraction form
    942.39/1,300.92 = 628.21/x
  3. Step 3: Cross multiply
    942.39x = 1,300.92 × 628.21
  4. Step 4: Simplify right side
    942.39x = 817,250.95
  5. Step 5: Solve for x
    x = 817,250.95/942.39
  6. Step 6: Final answer
    x = 867.21

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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.