Home / 21,938.74-30,275.47-12,380.66

Finding the Fourth Proportional to 21,938.74, 30,275.47 and 12,380.66

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Solution

The fourth proportional to 21,938.74, 30,275.47 and 12,380.66 is: 17,085.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,938.74 : 30,275.47 = 12,380.66 : x
  2. Step 2: Convert to fraction form
    21,938.74/30,275.47 = 12,380.66/x
  3. Step 3: Cross multiply
    21,938.74x = 30,275.47 × 12,380.66
  4. Step 4: Simplify right side
    21,938.74x = 374,830,300.41
  5. Step 5: Solve for x
    x = 374,830,300.41/21,938.74
  6. Step 6: Final answer
    x = 17,085.32

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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.