Home / 21,011.61-28,995.60-11,580.17

Finding the Fourth Proportional to 21,011.61, 28,995.60 and 11,580.17

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Solution

The fourth proportional to 21,011.61, 28,995.60 and 11,580.17 is: 15,980.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.61 : 28,995.60 = 11,580.17 : x
  2. Step 2: Convert to fraction form
    21,011.61/28,995.60 = 11,580.17/x
  3. Step 3: Cross multiply
    21,011.61x = 28,995.60 × 11,580.17
  4. Step 4: Simplify right side
    21,011.61x = 335,773,991.84
  5. Step 5: Solve for x
    x = 335,773,991.84/21,011.61
  6. Step 6: Final answer
    x = 15,980.40

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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.