Home / 21,438.48-29,570.34-15,078.57

Finding the Fourth Proportional to 21,438.48, 29,570.34 and 15,078.57

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Solution

The fourth proportional to 21,438.48, 29,570.34 and 15,078.57 is: 20,798.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,438.48 : 29,570.34 = 15,078.57 : x
  2. Step 2: Convert to fraction form
    21,438.48/29,570.34 = 15,078.57/x
  3. Step 3: Cross multiply
    21,438.48x = 29,570.34 × 15,078.57
  4. Step 4: Simplify right side
    21,438.48x = 445,878,293.76
  5. Step 5: Solve for x
    x = 445,878,293.76/21,438.48
  6. Step 6: Final answer
    x = 20,798.04

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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.