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Finding the Fourth Proportional to 1,672.61, 2,508.75 and 1,311.75

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Solution

The fourth proportional to 1,672.61, 2,508.75 and 1,311.75 is: 1,967.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,672.61 : 2,508.75 = 1,311.75 : x
  2. Step 2: Convert to fraction form
    1,672.61/2,508.75 = 1,311.75/x
  3. Step 3: Cross multiply
    1,672.61x = 2,508.75 × 1,311.75
  4. Step 4: Simplify right side
    1,672.61x = 3,290,852.81
  5. Step 5: Solve for x
    x = 3,290,852.81/1,672.61
  6. Step 6: Final answer
    x = 1,967.50

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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.