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Finding the Fourth Proportional to 15,903.28, 21,948.54 and 9,615.64

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Solution

The fourth proportional to 15,903.28, 21,948.54 and 9,615.64 is: 13,270.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,903.28 : 21,948.54 = 9,615.64 : x
  2. Step 2: Convert to fraction form
    15,903.28/21,948.54 = 9,615.64/x
  3. Step 3: Cross multiply
    15,903.28x = 21,948.54 × 9,615.64
  4. Step 4: Simplify right side
    15,903.28x = 211,049,259.17
  5. Step 5: Solve for x
    x = 211,049,259.17/15,903.28
  6. Step 6: Final answer
    x = 13,270.80

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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.