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Finding the Fourth Proportional to 1,520.90, 2,281.35 and 872.90

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Solution

The fourth proportional to 1,520.90, 2,281.35 and 872.90 is: 1,309.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.90 : 2,281.35 = 872.90 : x
  2. Step 2: Convert to fraction form
    1,520.90/2,281.35 = 872.90/x
  3. Step 3: Cross multiply
    1,520.90x = 2,281.35 × 872.90
  4. Step 4: Simplify right side
    1,520.90x = 1,991,390.42
  5. Step 5: Solve for x
    x = 1,991,390.42/1,520.90
  6. Step 6: Final answer
    x = 1,309.35

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1.5x scale

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.