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Finding the Fourth Proportional to 51,390.65, 70,910.03 and 28,722.40

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Solution

The fourth proportional to 51,390.65, 70,910.03 and 28,722.40 is: 39,631.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,390.65 : 70,910.03 = 28,722.40 : x
  2. Step 2: Convert to fraction form
    51,390.65/70,910.03 = 28,722.40/x
  3. Step 3: Cross multiply
    51,390.65x = 70,910.03 × 28,722.40
  4. Step 4: Simplify right side
    51,390.65x = 2,036,706,140.20
  5. Step 5: Solve for x
    x = 2,036,706,140.20/51,390.65
  6. Step 6: Final answer
    x = 39,631.84

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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.