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Finding the Fourth Proportional to 929.53, 1,285.64 and 864.73

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Solution

The fourth proportional to 929.53, 1,285.64 and 864.73 is: 1,196.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.53 : 1,285.64 = 864.73 : x
  2. Step 2: Convert to fraction form
    929.53/1,285.64 = 864.73/x
  3. Step 3: Cross multiply
    929.53x = 1,285.64 × 864.73
  4. Step 4: Simplify right side
    929.53x = 1,111,731.48
  5. Step 5: Solve for x
    x = 1,111,731.48/929.53
  6. Step 6: Final answer
    x = 1,196.01

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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.