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Finding the Fourth Proportional to 870.88, 1,203.36 and 697.60

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Solution

The fourth proportional to 870.88, 1,203.36 and 697.60 is: 963.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.88 : 1,203.36 = 697.60 : x
  2. Step 2: Convert to fraction form
    870.88/1,203.36 = 697.60/x
  3. Step 3: Cross multiply
    870.88x = 1,203.36 × 697.60
  4. Step 4: Simplify right side
    870.88x = 839,463.94
  5. Step 5: Solve for x
    x = 839,463.94/870.88
  6. Step 6: Final answer
    x = 963.93

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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.