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Finding the Fourth Proportional to 15,628.64, 21,565.92 and 8,913.76

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Solution

The fourth proportional to 15,628.64, 21,565.92 and 8,913.76 is: 12,300.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,628.64 : 21,565.92 = 8,913.76 : x
  2. Step 2: Convert to fraction form
    15,628.64/21,565.92 = 8,913.76/x
  3. Step 3: Cross multiply
    15,628.64x = 21,565.92 × 8,913.76
  4. Step 4: Simplify right side
    15,628.64x = 192,233,435.06
  5. Step 5: Solve for x
    x = 192,233,435.06/15,628.64
  6. Step 6: Final answer
    x = 12,300.07

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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.