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Finding the Fourth Proportional to 51,321.90, 70,823.52 and 28,661.30

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Solution

The fourth proportional to 51,321.90, 70,823.52 and 28,661.30 is: 39,552.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,321.90 : 70,823.52 = 28,661.30 : x
  2. Step 2: Convert to fraction form
    51,321.90/70,823.52 = 28,661.30/x
  3. Step 3: Cross multiply
    51,321.90x = 70,823.52 × 28,661.30
  4. Step 4: Simplify right side
    51,321.90x = 2,029,893,799.66
  5. Step 5: Solve for x
    x = 2,029,893,799.66/51,321.90
  6. Step 6: Final answer
    x = 39,552.20

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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.