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Finding the Fourth Proportional to 1,289.88, 1,937.46 and 851.76

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Solution

The fourth proportional to 1,289.88, 1,937.46 and 851.76 is: 1,279.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.88 : 1,937.46 = 851.76 : x
  2. Step 2: Convert to fraction form
    1,289.88/1,937.46 = 851.76/x
  3. Step 3: Cross multiply
    1,289.88x = 1,937.46 × 851.76
  4. Step 4: Simplify right side
    1,289.88x = 1,650,246.67
  5. Step 5: Solve for x
    x = 1,650,246.67/1,289.88
  6. Step 6: Final answer
    x = 1,279.38

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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.