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Finding the Fourth Proportional to 15,374.78, 21,218.48 and 8,661.72

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Solution

The fourth proportional to 15,374.78, 21,218.48 and 8,661.72 is: 11,953.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,374.78 : 21,218.48 = 8,661.72 : x
  2. Step 2: Convert to fraction form
    15,374.78/21,218.48 = 8,661.72/x
  3. Step 3: Cross multiply
    15,374.78x = 21,218.48 × 8,661.72
  4. Step 4: Simplify right side
    15,374.78x = 183,788,532.59
  5. Step 5: Solve for x
    x = 183,788,532.59/15,374.78
  6. Step 6: Final answer
    x = 11,953.90

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1.5x scale

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.