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Finding the Fourth Proportional to 15,860.40, 21,880.02 and 11,147.40

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Solution

The fourth proportional to 15,860.40, 21,880.02 and 11,147.40 is: 15,378.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,860.40 : 21,880.02 = 11,147.40 : x
  2. Step 2: Convert to fraction form
    15,860.40/21,880.02 = 11,147.40/x
  3. Step 3: Cross multiply
    15,860.40x = 21,880.02 × 11,147.40
  4. Step 4: Simplify right side
    15,860.40x = 243,905,334.95
  5. Step 5: Solve for x
    x = 243,905,334.95/15,860.40
  6. Step 6: Final answer
    x = 15,378.26

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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.