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Finding the Fourth Proportional to 839.31, 1,259.55 and 291.50

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Solution

The fourth proportional to 839.31, 1,259.55 and 291.50 is: 437.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.31 : 1,259.55 = 291.50 : x
  2. Step 2: Convert to fraction form
    839.31/1,259.55 = 291.50/x
  3. Step 3: Cross multiply
    839.31x = 1,259.55 × 291.50
  4. Step 4: Simplify right side
    839.31x = 367,157.25
  5. Step 5: Solve for x
    x = 367,157.25/839.31
  6. Step 6: Final answer
    x = 437.45

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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.