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Finding the Fourth Proportional to 931.40, 1,398.72 and 899

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Solution

The fourth proportional to 931.40, 1,398.72 and 899 is: 1,350.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.40 : 1,398.72 = 899 : x
  2. Step 2: Convert to fraction form
    931.40/1,398.72 = 899/x
  3. Step 3: Cross multiply
    931.40x = 1,398.72 × 899
  4. Step 4: Simplify right side
    931.40x = 1,257,449.28
  5. Step 5: Solve for x
    x = 1,257,449.28/931.40
  6. Step 6: Final answer
    x = 1,350.06

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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.