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Finding the Fourth Proportional to 929.81, 1,282.82 and 664.28

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Solution

The fourth proportional to 929.81, 1,282.82 and 664.28 is: 916.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.81 : 1,282.82 = 664.28 : x
  2. Step 2: Convert to fraction form
    929.81/1,282.82 = 664.28/x
  3. Step 3: Cross multiply
    929.81x = 1,282.82 × 664.28
  4. Step 4: Simplify right side
    929.81x = 852,141.93
  5. Step 5: Solve for x
    x = 852,141.93/929.81
  6. Step 6: Final answer
    x = 916.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.