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Finding the Fourth Proportional to 48,339, 66,708 and 28,209.78

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Solution

The fourth proportional to 48,339, 66,708 and 28,209.78 is: 38,929.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    48,339 : 66,708 = 28,209.78 : x
  2. Step 2: Convert to fraction form
    48,339/66,708 = 28,209.78/x
  3. Step 3: Cross multiply
    48,339x = 66,708 × 28,209.78
  4. Step 4: Simplify right side
    48,339x = 1,881,818,004.24
  5. Step 5: Solve for x
    x = 1,881,818,004.24/48,339
  6. Step 6: Final answer
    x = 38,929.60

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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.