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Finding the Fourth Proportional to 869.42, 1,301.80 and 663.01

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Solution

The fourth proportional to 869.42, 1,301.80 and 663.01 is: 992.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.42 : 1,301.80 = 663.01 : x
  2. Step 2: Convert to fraction form
    869.42/1,301.80 = 663.01/x
  3. Step 3: Cross multiply
    869.42x = 1,301.80 × 663.01
  4. Step 4: Simplify right side
    869.42x = 863,106.42
  5. Step 5: Solve for x
    x = 863,106.42/869.42
  6. Step 6: Final answer
    x = 992.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.