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Finding the Fourth Proportional to 870.81, 1,305.25 and 350.68

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Solution

The fourth proportional to 870.81, 1,305.25 and 350.68 is: 525.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.81 : 1,305.25 = 350.68 : x
  2. Step 2: Convert to fraction form
    870.81/1,305.25 = 350.68/x
  3. Step 3: Cross multiply
    870.81x = 1,305.25 × 350.68
  4. Step 4: Simplify right side
    870.81x = 457,725.07
  5. Step 5: Solve for x
    x = 457,725.07/870.81
  6. Step 6: Final answer
    x = 525.63

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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.