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Finding the Fourth Proportional to 840.68, 1,260.17 and 320.54

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Solution

The fourth proportional to 840.68, 1,260.17 and 320.54 is: 480.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.68 : 1,260.17 = 320.54 : x
  2. Step 2: Convert to fraction form
    840.68/1,260.17 = 320.54/x
  3. Step 3: Cross multiply
    840.68x = 1,260.17 × 320.54
  4. Step 4: Simplify right side
    840.68x = 403,933.29
  5. Step 5: Solve for x
    x = 403,933.29/840.68
  6. Step 6: Final answer
    x = 480.49

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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.