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Finding the Fourth Proportional to 929.07, 1,392.38 and 518.40

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Solution

The fourth proportional to 929.07, 1,392.38 and 518.40 is: 776.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.07 : 1,392.38 = 518.40 : x
  2. Step 2: Convert to fraction form
    929.07/1,392.38 = 518.40/x
  3. Step 3: Cross multiply
    929.07x = 1,392.38 × 518.40
  4. Step 4: Simplify right side
    929.07x = 721,811.09
  5. Step 5: Solve for x
    x = 721,811.09/929.07
  6. Step 6: Final answer
    x = 776.92

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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.