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Finding the Fourth Proportional to 51,642.72, 71,263.80 and 28,977.84

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Solution

The fourth proportional to 51,642.72, 71,263.80 and 28,977.84 is: 39,987.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,642.72 : 71,263.80 = 28,977.84 : x
  2. Step 2: Convert to fraction form
    51,642.72/71,263.80 = 28,977.84/x
  3. Step 3: Cross multiply
    51,642.72x = 71,263.80 × 28,977.84
  4. Step 4: Simplify right side
    51,642.72x = 2,065,070,994.19
  5. Step 5: Solve for x
    x = 2,065,070,994.19/51,642.72
  6. Step 6: Final answer
    x = 39,987.65

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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.