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Finding the Fourth Proportional to 21,988.40, 30,345 and 13,041.20

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Solution

The fourth proportional to 21,988.40, 30,345 and 13,041.20 is: 17,997.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,988.40 : 30,345 = 13,041.20 : x
  2. Step 2: Convert to fraction form
    21,988.40/30,345 = 13,041.20/x
  3. Step 3: Cross multiply
    21,988.40x = 30,345 × 13,041.20
  4. Step 4: Simplify right side
    21,988.40x = 395,735,214
  5. Step 5: Solve for x
    x = 395,735,214/21,988.40
  6. Step 6: Final answer
    x = 17,997.45

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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.