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Finding the Fourth Proportional to 942.06, 1,300.17 and 708.78

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Solution

The fourth proportional to 942.06, 1,300.17 and 708.78 is: 978.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.06 : 1,300.17 = 708.78 : x
  2. Step 2: Convert to fraction form
    942.06/1,300.17 = 708.78/x
  3. Step 3: Cross multiply
    942.06x = 1,300.17 × 708.78
  4. Step 4: Simplify right side
    942.06x = 921,534.49
  5. Step 5: Solve for x
    x = 921,534.49/942.06
  6. Step 6: Final answer
    x = 978.21

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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.