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Finding the Fourth Proportional to 839.76, 1,259.94 and 292.10

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Solution

The fourth proportional to 839.76, 1,259.94 and 292.10 is: 438.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.76 : 1,259.94 = 292.10 : x
  2. Step 2: Convert to fraction form
    839.76/1,259.94 = 292.10/x
  3. Step 3: Cross multiply
    839.76x = 1,259.94 × 292.10
  4. Step 4: Simplify right side
    839.76x = 368,022.17
  5. Step 5: Solve for x
    x = 368,022.17/839.76
  6. Step 6: Final answer
    x = 438.25

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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.