Home / 21,011.48-28,995.86-11,580.05

Finding the Fourth Proportional to 21,011.48, 28,995.86 and 11,580.05

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Solution

The fourth proportional to 21,011.48, 28,995.86 and 11,580.05 is: 15,980.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,011.48 : 28,995.86 = 11,580.05 : x
  2. Step 2: Convert to fraction form
    21,011.48/28,995.86 = 11,580.05/x
  3. Step 3: Cross multiply
    21,011.48x = 28,995.86 × 11,580.05
  4. Step 4: Simplify right side
    21,011.48x = 335,773,381.79
  5. Step 5: Solve for x
    x = 335,773,381.79/21,011.48
  6. Step 6: Final answer
    x = 15,980.47

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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.