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Finding the Fourth Proportional to 929.18, 1,393.80 and 518.01

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Solution

The fourth proportional to 929.18, 1,393.80 and 518.01 is: 777.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.18 : 1,393.80 = 518.01 : x
  2. Step 2: Convert to fraction form
    929.18/1,393.80 = 518.01/x
  3. Step 3: Cross multiply
    929.18x = 1,393.80 × 518.01
  4. Step 4: Simplify right side
    929.18x = 722,002.34
  5. Step 5: Solve for x
    x = 722,002.34/929.18
  6. Step 6: Final answer
    x = 777.04

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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.