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Finding the Fourth Proportional to 12,880.50, 17,774.91 and 7,215.28

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Solution

The fourth proportional to 12,880.50, 17,774.91 and 7,215.28 is: 9,956.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,880.50 : 17,774.91 = 7,215.28 : x
  2. Step 2: Convert to fraction form
    12,880.50/17,774.91 = 7,215.28/x
  3. Step 3: Cross multiply
    12,880.50x = 17,774.91 × 7,215.28
  4. Step 4: Simplify right side
    12,880.50x = 128,250,952.62
  5. Step 5: Solve for x
    x = 128,250,952.62/12,880.50
  6. Step 6: Final answer
    x = 9,956.99

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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.