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Finding the Fourth Proportional to 847.84, 1,270.36 and 815.88

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Solution

The fourth proportional to 847.84, 1,270.36 and 815.88 is: 1,222.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.84 : 1,270.36 = 815.88 : x
  2. Step 2: Convert to fraction form
    847.84/1,270.36 = 815.88/x
  3. Step 3: Cross multiply
    847.84x = 1,270.36 × 815.88
  4. Step 4: Simplify right side
    847.84x = 1,036,461.32
  5. Step 5: Solve for x
    x = 1,036,461.32/847.84
  6. Step 6: Final answer
    x = 1,222.47

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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.