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Finding the Fourth Proportional to 15,807.86, 21,815.28 and 8,734.74

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Solution

The fourth proportional to 15,807.86, 21,815.28 and 8,734.74 is: 12,054.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,807.86 : 21,815.28 = 8,734.74 : x
  2. Step 2: Convert to fraction form
    15,807.86/21,815.28 = 8,734.74/x
  3. Step 3: Cross multiply
    15,807.86x = 21,815.28 × 8,734.74
  4. Step 4: Simplify right side
    15,807.86x = 190,550,798.83
  5. Step 5: Solve for x
    x = 190,550,798.83/15,807.86
  6. Step 6: Final answer
    x = 12,054.18

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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.