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Finding the Fourth Proportional to 15,620.99, 21,564.08 and 9,963.50

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Solution

The fourth proportional to 15,620.99, 21,564.08 and 9,963.50 is: 13,754.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,620.99 : 21,564.08 = 9,963.50 : x
  2. Step 2: Convert to fraction form
    15,620.99/21,564.08 = 9,963.50/x
  3. Step 3: Cross multiply
    15,620.99x = 21,564.08 × 9,963.50
  4. Step 4: Simplify right side
    15,620.99x = 214,853,590.81
  5. Step 5: Solve for x
    x = 214,853,590.81/15,620.99
  6. Step 6: Final answer
    x = 13,754.16

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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.