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Finding the Fourth Proportional to 929.91, 1,388.81 and 805.58

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Solution

The fourth proportional to 929.91, 1,388.81 and 805.58 is: 1,203.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.91 : 1,388.81 = 805.58 : x
  2. Step 2: Convert to fraction form
    929.91/1,388.81 = 805.58/x
  3. Step 3: Cross multiply
    929.91x = 1,388.81 × 805.58
  4. Step 4: Simplify right side
    929.91x = 1,118,797.56
  5. Step 5: Solve for x
    x = 1,118,797.56/929.91
  6. Step 6: Final answer
    x = 1,203.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.