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Finding the Fourth Proportional to 807.64, 1,211.60 and 259.76

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Solution

The fourth proportional to 807.64, 1,211.60 and 259.76 is: 389.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.64 : 1,211.60 = 259.76 : x
  2. Step 2: Convert to fraction form
    807.64/1,211.60 = 259.76/x
  3. Step 3: Cross multiply
    807.64x = 1,211.60 × 259.76
  4. Step 4: Simplify right side
    807.64x = 314,725.22
  5. Step 5: Solve for x
    x = 314,725.22/807.64
  6. Step 6: Final answer
    x = 389.69

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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.