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Finding the Fourth Proportional to 931.66, 1,397.58 and 315.48

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Solution

The fourth proportional to 931.66, 1,397.58 and 315.48 is: 473.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.66 : 1,397.58 = 315.48 : x
  2. Step 2: Convert to fraction form
    931.66/1,397.58 = 315.48/x
  3. Step 3: Cross multiply
    931.66x = 1,397.58 × 315.48
  4. Step 4: Simplify right side
    931.66x = 440,908.54
  5. Step 5: Solve for x
    x = 440,908.54/931.66
  6. Step 6: Final answer
    x = 473.25

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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.