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Finding the Fourth Proportional to 839.48, 1,259.76 and 319.48

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Solution

The fourth proportional to 839.48, 1,259.76 and 319.48 is: 479.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.48 : 1,259.76 = 319.48 : x
  2. Step 2: Convert to fraction form
    839.48/1,259.76 = 319.48/x
  3. Step 3: Cross multiply
    839.48x = 1,259.76 × 319.48
  4. Step 4: Simplify right side
    839.48x = 402,468.12
  5. Step 5: Solve for x
    x = 402,468.12/839.48
  6. Step 6: Final answer
    x = 479.43

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1.5x scale

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.