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Finding the Fourth Proportional to 929.45, 1,392.98 and 380.98

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Solution

The fourth proportional to 929.45, 1,392.98 and 380.98 is: 570.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.45 : 1,392.98 = 380.98 : x
  2. Step 2: Convert to fraction form
    929.45/1,392.98 = 380.98/x
  3. Step 3: Cross multiply
    929.45x = 1,392.98 × 380.98
  4. Step 4: Simplify right side
    929.45x = 530,697.52
  5. Step 5: Solve for x
    x = 530,697.52/929.45
  6. Step 6: Final answer
    x = 570.98

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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.