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Finding the Fourth Proportional to 1,520.79, 2,281.20 and 643.30

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Solution

The fourth proportional to 1,520.79, 2,281.20 and 643.30 is: 964.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.79 : 2,281.20 = 643.30 : x
  2. Step 2: Convert to fraction form
    1,520.79/2,281.20 = 643.30/x
  3. Step 3: Cross multiply
    1,520.79x = 2,281.20 × 643.30
  4. Step 4: Simplify right side
    1,520.79x = 1,467,495.96
  5. Step 5: Solve for x
    x = 1,467,495.96/1,520.79
  6. Step 6: Final answer
    x = 964.96

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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.