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Finding the Fourth Proportional to 929.49, 1,393.08 and 813.66

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Solution

The fourth proportional to 929.49, 1,393.08 and 813.66 is: 1,219.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.49 : 1,393.08 = 813.66 : x
  2. Step 2: Convert to fraction form
    929.49/1,393.08 = 813.66/x
  3. Step 3: Cross multiply
    929.49x = 1,393.08 × 813.66
  4. Step 4: Simplify right side
    929.49x = 1,133,493.47
  5. Step 5: Solve for x
    x = 1,133,493.47/929.49
  6. Step 6: Final answer
    x = 1,219.48

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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.