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Finding the Fourth Proportional to 1,294.08, 1,938.56 and 805.76

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Solution

The fourth proportional to 1,294.08, 1,938.56 and 805.76 is: 1,207.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.08 : 1,938.56 = 805.76 : x
  2. Step 2: Convert to fraction form
    1,294.08/1,938.56 = 805.76/x
  3. Step 3: Cross multiply
    1,294.08x = 1,938.56 × 805.76
  4. Step 4: Simplify right side
    1,294.08x = 1,562,014.11
  5. Step 5: Solve for x
    x = 1,562,014.11/1,294.08
  6. Step 6: Final answer
    x = 1,207.05

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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.