Home / 21,011.90-28,996.55-11,580.46

Finding the Fourth Proportional to 21,011.90, 28,996.55 and 11,580.46

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Solution

The fourth proportional to 21,011.90, 28,996.55 and 11,580.46 is: 15,981.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.90 : 28,996.55 = 11,580.46 : x
  2. Step 2: Convert to fraction form
    21,011.90/28,996.55 = 11,580.46/x
  3. Step 3: Cross multiply
    21,011.90x = 28,996.55 × 11,580.46
  4. Step 4: Simplify right side
    21,011.90x = 335,793,300.45
  5. Step 5: Solve for x
    x = 335,793,300.45/21,011.90
  6. Step 6: Final answer
    x = 15,981.11

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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.