Home / 38,720.20-53,438.28-21,729

Finding the Fourth Proportional to 38,720.20, 53,438.28 and 21,729

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Solution

The fourth proportional to 38,720.20, 53,438.28 and 21,729 is: 29,988.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,720.20 : 53,438.28 = 21,729 : x
  2. Step 2: Convert to fraction form
    38,720.20/53,438.28 = 21,729/x
  3. Step 3: Cross multiply
    38,720.20x = 53,438.28 × 21,729
  4. Step 4: Simplify right side
    38,720.20x = 1,161,160,386.12
  5. Step 5: Solve for x
    x = 1,161,160,386.12/38,720.20
  6. Step 6: Final answer
    x = 29,988.49

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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.