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Finding the Fourth Proportional to 7,612.88, 11,420.24 and 2,931.80

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Solution

The fourth proportional to 7,612.88, 11,420.24 and 2,931.80 is: 4,398.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,612.88 : 11,420.24 = 2,931.80 : x
  2. Step 2: Convert to fraction form
    7,612.88/11,420.24 = 2,931.80/x
  3. Step 3: Cross multiply
    7,612.88x = 11,420.24 × 2,931.80
  4. Step 4: Simplify right side
    7,612.88x = 33,481,859.63
  5. Step 5: Solve for x
    x = 33,481,859.63/7,612.88
  6. Step 6: Final answer
    x = 4,398.05

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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.