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Finding the Fourth Proportional to 15,873.92, 21,904.86 and 8,702.69

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Solution

The fourth proportional to 15,873.92, 21,904.86 and 8,702.69 is: 12,009.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,873.92 : 21,904.86 = 8,702.69 : x
  2. Step 2: Convert to fraction form
    15,873.92/21,904.86 = 8,702.69/x
  3. Step 3: Cross multiply
    15,873.92x = 21,904.86 × 8,702.69
  4. Step 4: Simplify right side
    15,873.92x = 190,631,096.55
  5. Step 5: Solve for x
    x = 190,631,096.55/15,873.92
  6. Step 6: Final answer
    x = 12,009.08

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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.