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Finding the Fourth Proportional to 21,062.88, 31,588.92 and 9,966.60

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Solution

The fourth proportional to 21,062.88, 31,588.92 and 9,966.60 is: 14,947.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,062.88 : 31,588.92 = 9,966.60 : x
  2. Step 2: Convert to fraction form
    21,062.88/31,588.92 = 9,966.60/x
  3. Step 3: Cross multiply
    21,062.88x = 31,588.92 × 9,966.60
  4. Step 4: Simplify right side
    21,062.88x = 314,834,130.07
  5. Step 5: Solve for x
    x = 314,834,130.07/21,062.88
  6. Step 6: Final answer
    x = 14,947.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.