Home / 21,386.61-31,854.39-20,427.15

Finding the Fourth Proportional to 21,386.61, 31,854.39 and 20,427.15

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Solution

The fourth proportional to 21,386.61, 31,854.39 and 20,427.15 is: 30,425.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,386.61 : 31,854.39 = 20,427.15 : x
  2. Step 2: Convert to fraction form
    21,386.61/31,854.39 = 20,427.15/x
  3. Step 3: Cross multiply
    21,386.61x = 31,854.39 × 20,427.15
  4. Step 4: Simplify right side
    21,386.61x = 650,694,402.69
  5. Step 5: Solve for x
    x = 650,694,402.69/21,386.61
  6. Step 6: Final answer
    x = 30,425.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.