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Finding the Fourth Proportional to 15,878.68, 21,909.28 and 8,803.60

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Solution

The fourth proportional to 15,878.68, 21,909.28 and 8,803.60 is: 12,147.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,878.68 : 21,909.28 = 8,803.60 : x
  2. Step 2: Convert to fraction form
    15,878.68/21,909.28 = 8,803.60/x
  3. Step 3: Cross multiply
    15,878.68x = 21,909.28 × 8,803.60
  4. Step 4: Simplify right side
    15,878.68x = 192,880,537.41
  5. Step 5: Solve for x
    x = 192,880,537.41/15,878.68
  6. Step 6: Final answer
    x = 12,147.14

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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.