Home / 21,002.51-28,973.25-13,442.78

Finding the Fourth Proportional to 21,002.51, 28,973.25 and 13,442.78

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Solution

The fourth proportional to 21,002.51, 28,973.25 and 13,442.78 is: 18,544.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,002.51 : 28,973.25 = 13,442.78 : x
  2. Step 2: Convert to fraction form
    21,002.51/28,973.25 = 13,442.78/x
  3. Step 3: Cross multiply
    21,002.51x = 28,973.25 × 13,442.78
  4. Step 4: Simplify right side
    21,002.51x = 389,481,098.07
  5. Step 5: Solve for x
    x = 389,481,098.07/21,002.51
  6. Step 6: Final answer
    x = 18,544.50

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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.