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Finding the Fourth Proportional to 839.96, 1,259.95 and 292.16

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Solution

The fourth proportional to 839.96, 1,259.95 and 292.16 is: 438.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.96 : 1,259.95 = 292.16 : x
  2. Step 2: Convert to fraction form
    839.96/1,259.95 = 292.16/x
  3. Step 3: Cross multiply
    839.96x = 1,259.95 × 292.16
  4. Step 4: Simplify right side
    839.96x = 368,110.87
  5. Step 5: Solve for x
    x = 368,110.87/839.96
  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.