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Finding the Fourth Proportional to 839.07, 1,156.88 and 681.12

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Solution

The fourth proportional to 839.07, 1,156.88 and 681.12 is: 939.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.07 : 1,156.88 = 681.12 : x
  2. Step 2: Convert to fraction form
    839.07/1,156.88 = 681.12/x
  3. Step 3: Cross multiply
    839.07x = 1,156.88 × 681.12
  4. Step 4: Simplify right side
    839.07x = 787,970.70
  5. Step 5: Solve for x
    x = 787,970.70/839.07
  6. Step 6: Final answer
    x = 939.10

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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.