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Finding the Fourth Proportional to 830.79, 1,246.41 and 253.80

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Solution

The fourth proportional to 830.79, 1,246.41 and 253.80 is: 380.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.79 : 1,246.41 = 253.80 : x
  2. Step 2: Convert to fraction form
    830.79/1,246.41 = 253.80/x
  3. Step 3: Cross multiply
    830.79x = 1,246.41 × 253.80
  4. Step 4: Simplify right side
    830.79x = 316,338.86
  5. Step 5: Solve for x
    x = 316,338.86/830.79
  6. Step 6: Final answer
    x = 380.77

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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.