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Finding the Fourth Proportional to 21,960.80, 30,303.98 and 13,006.80

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Solution

The fourth proportional to 21,960.80, 30,303.98 and 13,006.80 is: 17,948.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,960.80 : 30,303.98 = 13,006.80 : x
  2. Step 2: Convert to fraction form
    21,960.80/30,303.98 = 13,006.80/x
  3. Step 3: Cross multiply
    21,960.80x = 30,303.98 × 13,006.80
  4. Step 4: Simplify right side
    21,960.80x = 394,157,807.06
  5. Step 5: Solve for x
    x = 394,157,807.06/21,960.80
  6. Step 6: Final answer
    x = 17,948.24

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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.