Home / 21,347.64-29,460.24-13,390.20

Finding the Fourth Proportional to 21,347.64, 29,460.24 and 13,390.20

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Solution

The fourth proportional to 21,347.64, 29,460.24 and 13,390.20 is: 18,478.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,347.64 : 29,460.24 = 13,390.20 : x
  2. Step 2: Convert to fraction form
    21,347.64/29,460.24 = 13,390.20/x
  3. Step 3: Cross multiply
    21,347.64x = 29,460.24 × 13,390.20
  4. Step 4: Simplify right side
    21,347.64x = 394,478,505.65
  5. Step 5: Solve for x
    x = 394,478,505.65/21,347.64
  6. Step 6: Final answer
    x = 18,478.79

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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.