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Finding the Fourth Proportional to 931.41, 1,402.65 and 811.13

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Solution

The fourth proportional to 931.41, 1,402.65 and 811.13 is: 1,221.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.41 : 1,402.65 = 811.13 : x
  2. Step 2: Convert to fraction form
    931.41/1,402.65 = 811.13/x
  3. Step 3: Cross multiply
    931.41x = 1,402.65 × 811.13
  4. Step 4: Simplify right side
    931.41x = 1,137,724.48
  5. Step 5: Solve for x
    x = 1,137,724.48/931.41
  6. Step 6: Final answer
    x = 1,221.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.