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Finding the Fourth Proportional to 15,639.68, 21,583.03 and 8,565.64

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Solution

The fourth proportional to 15,639.68, 21,583.03 and 8,565.64 is: 11,820.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,639.68 : 21,583.03 = 8,565.64 : x
  2. Step 2: Convert to fraction form
    15,639.68/21,583.03 = 8,565.64/x
  3. Step 3: Cross multiply
    15,639.68x = 21,583.03 × 8,565.64
  4. Step 4: Simplify right side
    15,639.68x = 184,872,389.72
  5. Step 5: Solve for x
    x = 184,872,389.72/15,639.68
  6. Step 6: Final answer
    x = 11,820.73

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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.