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Finding the Fourth Proportional to 7,721.64, 10,655.87 and 4,184.87

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Solution

The fourth proportional to 7,721.64, 10,655.87 and 4,184.87 is: 5,775.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,721.64 : 10,655.87 = 4,184.87 : x
  2. Step 2: Convert to fraction form
    7,721.64/10,655.87 = 4,184.87/x
  3. Step 3: Cross multiply
    7,721.64x = 10,655.87 × 4,184.87
  4. Step 4: Simplify right side
    7,721.64x = 44,593,356.48
  5. Step 5: Solve for x
    x = 44,593,356.48/7,721.64
  6. Step 6: Final answer
    x = 5,775.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.