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Finding the Fourth Proportional to 934.95, 1,290.78 and 831.15

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Solution

The fourth proportional to 934.95, 1,290.78 and 831.15 is: 1,147.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.95 : 1,290.78 = 831.15 : x
  2. Step 2: Convert to fraction form
    934.95/1,290.78 = 831.15/x
  3. Step 3: Cross multiply
    934.95x = 1,290.78 × 831.15
  4. Step 4: Simplify right side
    934.95x = 1,072,831.80
  5. Step 5: Solve for x
    x = 1,072,831.80/934.95
  6. Step 6: Final answer
    x = 1,147.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.