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Finding the Fourth Proportional to 51,807.84, 77,711.76 and 20,643.36

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Solution

The fourth proportional to 51,807.84, 77,711.76 and 20,643.36 is: 30,965.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,807.84 : 77,711.76 = 20,643.36 : x
  2. Step 2: Convert to fraction form
    51,807.84/77,711.76 = 20,643.36/x
  3. Step 3: Cross multiply
    51,807.84x = 77,711.76 × 20,643.36
  4. Step 4: Simplify right side
    51,807.84x = 1,604,231,837.91
  5. Step 5: Solve for x
    x = 1,604,231,837.91/51,807.84
  6. Step 6: Final answer
    x = 30,965.04

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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.