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Finding the Fourth Proportional to 929.18, 1,393.83 and 312.90

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Solution

The fourth proportional to 929.18, 1,393.83 and 312.90 is: 469.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.18 : 1,393.83 = 312.90 : x
  2. Step 2: Convert to fraction form
    929.18/1,393.83 = 312.90/x
  3. Step 3: Cross multiply
    929.18x = 1,393.83 × 312.90
  4. Step 4: Simplify right side
    929.18x = 436,129.41
  5. Step 5: Solve for x
    x = 436,129.41/929.18
  6. Step 6: Final answer
    x = 469.37

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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.