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Finding the Fourth Proportional to 929.58, 1,391.64 and 814.25

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Solution

The fourth proportional to 929.58, 1,391.64 and 814.25 is: 1,218.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.58 : 1,391.64 = 814.25 : x
  2. Step 2: Convert to fraction form
    929.58/1,391.64 = 814.25/x
  3. Step 3: Cross multiply
    929.58x = 1,391.64 × 814.25
  4. Step 4: Simplify right side
    929.58x = 1,133,146.41
  5. Step 5: Solve for x
    x = 1,133,146.41/929.58
  6. Step 6: Final answer
    x = 1,218.98

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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.