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Finding the Fourth Proportional to 15,774.61, 21,768.69 and 8,700.88

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Solution

The fourth proportional to 15,774.61, 21,768.69 and 8,700.88 is: 12,007.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,774.61 : 21,768.69 = 8,700.88 : x
  2. Step 2: Convert to fraction form
    15,774.61/21,768.69 = 8,700.88/x
  3. Step 3: Cross multiply
    15,774.61x = 21,768.69 × 8,700.88
  4. Step 4: Simplify right side
    15,774.61x = 189,406,759.45
  5. Step 5: Solve for x
    x = 189,406,759.45/15,774.61
  6. Step 6: Final answer
    x = 12,007.06

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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.