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Finding the Fourth Proportional to 15,808.86, 21,815.93 and 8,735.13

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Solution

The fourth proportional to 15,808.86, 21,815.93 and 8,735.13 is: 12,054.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,808.86 : 21,815.93 = 8,735.13 : x
  2. Step 2: Convert to fraction form
    15,808.86/21,815.93 = 8,735.13/x
  3. Step 3: Cross multiply
    15,808.86x = 21,815.93 × 8,735.13
  4. Step 4: Simplify right side
    15,808.86x = 190,565,006.46
  5. Step 5: Solve for x
    x = 190,565,006.46/15,808.86
  6. Step 6: Final answer
    x = 12,054.32

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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.