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Finding the Fourth Proportional to 15,774.99, 21,769.61 and 8,702.61

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Solution

The fourth proportional to 15,774.99, 21,769.61 and 8,702.61 is: 12,009.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,774.99 : 21,769.61 = 8,702.61 : x
  2. Step 2: Convert to fraction form
    15,774.99/21,769.61 = 8,702.61/x
  3. Step 3: Cross multiply
    15,774.99x = 21,769.61 × 8,702.61
  4. Step 4: Simplify right side
    15,774.99x = 189,452,382.17
  5. Step 5: Solve for x
    x = 189,452,382.17/15,774.99
  6. Step 6: Final answer
    x = 12,009.67

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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.