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Finding the Fourth Proportional to 929.19, 1,392.55 and 380.74

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Solution

The fourth proportional to 929.19, 1,392.55 and 380.74 is: 570.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.19 : 1,392.55 = 380.74 : x
  2. Step 2: Convert to fraction form
    929.19/1,392.55 = 380.74/x
  3. Step 3: Cross multiply
    929.19x = 1,392.55 × 380.74
  4. Step 4: Simplify right side
    929.19x = 530,199.49
  5. Step 5: Solve for x
    x = 530,199.49/929.19
  6. Step 6: Final answer
    x = 570.60

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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.