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Finding the Fourth Proportional to 870.72, 1,202.88 and 685.44

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Solution

The fourth proportional to 870.72, 1,202.88 and 685.44 is: 946.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.72 : 1,202.88 = 685.44 : x
  2. Step 2: Convert to fraction form
    870.72/1,202.88 = 685.44/x
  3. Step 3: Cross multiply
    870.72x = 1,202.88 × 685.44
  4. Step 4: Simplify right side
    870.72x = 824,502.07
  5. Step 5: Solve for x
    x = 824,502.07/870.72
  6. Step 6: Final answer
    x = 946.92

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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.