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Finding the Fourth Proportional to 870.48, 1,201.92 and 684.87

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Solution

The fourth proportional to 870.48, 1,201.92 and 684.87 is: 945.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.48 : 1,201.92 = 684.87 : x
  2. Step 2: Convert to fraction form
    870.48/1,201.92 = 684.87/x
  3. Step 3: Cross multiply
    870.48x = 1,201.92 × 684.87
  4. Step 4: Simplify right side
    870.48x = 823,158.95
  5. Step 5: Solve for x
    x = 823,158.95/870.48
  6. Step 6: Final answer
    x = 945.64

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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.