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Finding the Fourth Proportional to 870.08, 1,201.92 and 695.20

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Solution

The fourth proportional to 870.08, 1,201.92 and 695.20 is: 960.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.08 : 1,201.92 = 695.20 : x
  2. Step 2: Convert to fraction form
    870.08/1,201.92 = 695.20/x
  3. Step 3: Cross multiply
    870.08x = 1,201.92 × 695.20
  4. Step 4: Simplify right side
    870.08x = 835,574.78
  5. Step 5: Solve for x
    x = 835,574.78/870.08
  6. Step 6: Final answer
    x = 960.34

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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.