Home / 20,531.81-28,323.71-13,261.40

Finding the Fourth Proportional to 20,531.81, 28,323.71 and 13,261.40

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Solution

The fourth proportional to 20,531.81, 28,323.71 and 13,261.40 is: 18,294.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,531.81 : 28,323.71 = 13,261.40 : x
  2. Step 2: Convert to fraction form
    20,531.81/28,323.71 = 13,261.40/x
  3. Step 3: Cross multiply
    20,531.81x = 28,323.71 × 13,261.40
  4. Step 4: Simplify right side
    20,531.81x = 375,612,151.76
  5. Step 5: Solve for x
    x = 375,612,151.76/20,531.81
  6. Step 6: Final answer
    x = 18,294.15

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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.