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Finding the Fourth Proportional to 988.01, 1,474.79 and 871.25

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Solution

The fourth proportional to 988.01, 1,474.79 and 871.25 is: 1,300.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.01 : 1,474.79 = 871.25 : x
  2. Step 2: Convert to fraction form
    988.01/1,474.79 = 871.25/x
  3. Step 3: Cross multiply
    988.01x = 1,474.79 × 871.25
  4. Step 4: Simplify right side
    988.01x = 1,284,899.06
  5. Step 5: Solve for x
    x = 1,284,899.06/988.01
  6. Step 6: Final answer
    x = 1,300.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.