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Finding the Fourth Proportional to 931.74, 1,398.06 and 659.58

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Solution

The fourth proportional to 931.74, 1,398.06 and 659.58 is: 989.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.74 : 1,398.06 = 659.58 : x
  2. Step 2: Convert to fraction form
    931.74/1,398.06 = 659.58/x
  3. Step 3: Cross multiply
    931.74x = 1,398.06 × 659.58
  4. Step 4: Simplify right side
    931.74x = 922,132.41
  5. Step 5: Solve for x
    x = 922,132.41/931.74
  6. Step 6: Final answer
    x = 989.69

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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.