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Finding the Fourth Proportional to 15,991.72, 22,068.71 and 8,918.60

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Solution

The fourth proportional to 15,991.72, 22,068.71 and 8,918.60 is: 12,307.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,991.72 : 22,068.71 = 8,918.60 : x
  2. Step 2: Convert to fraction form
    15,991.72/22,068.71 = 8,918.60/x
  3. Step 3: Cross multiply
    15,991.72x = 22,068.71 × 8,918.60
  4. Step 4: Simplify right side
    15,991.72x = 196,821,997.01
  5. Step 5: Solve for x
    x = 196,821,997.01/15,991.72
  6. Step 6: Final answer
    x = 12,307.74

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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.