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Finding the Fourth Proportional to 839.84, 1,158.90 and 777.92

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Solution

The fourth proportional to 839.84, 1,158.90 and 777.92 is: 1,073.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.84 : 1,158.90 = 777.92 : x
  2. Step 2: Convert to fraction form
    839.84/1,158.90 = 777.92/x
  3. Step 3: Cross multiply
    839.84x = 1,158.90 × 777.92
  4. Step 4: Simplify right side
    839.84x = 901,531.49
  5. Step 5: Solve for x
    x = 901,531.49/839.84
  6. Step 6: Final answer
    x = 1,073.46

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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.