Home / 21,319.40-31,981.80-11,445.12

Finding the Fourth Proportional to 21,319.40, 31,981.80 and 11,445.12

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Solution

The fourth proportional to 21,319.40, 31,981.80 and 11,445.12 is: 17,169.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,319.40 : 31,981.80 = 11,445.12 : x
  2. Step 2: Convert to fraction form
    21,319.40/31,981.80 = 11,445.12/x
  3. Step 3: Cross multiply
    21,319.40x = 31,981.80 × 11,445.12
  4. Step 4: Simplify right side
    21,319.40x = 366,035,538.82
  5. Step 5: Solve for x
    x = 366,035,538.82/21,319.40
  6. Step 6: Final answer
    x = 17,169.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.