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Finding the Fourth Proportional to 15,528.71, 21,443.84 and 9,865.28

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Solution

The fourth proportional to 15,528.71, 21,443.84 and 9,865.28 is: 13,623.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,528.71 : 21,443.84 = 9,865.28 : x
  2. Step 2: Convert to fraction form
    15,528.71/21,443.84 = 9,865.28/x
  3. Step 3: Cross multiply
    15,528.71x = 21,443.84 × 9,865.28
  4. Step 4: Simplify right side
    15,528.71x = 211,549,485.88
  5. Step 5: Solve for x
    x = 211,549,485.88/15,528.71
  6. Step 6: Final answer
    x = 13,623.12

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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.