Home / 21,398.40-29,528.64-13,438.08

Finding the Fourth Proportional to 21,398.40, 29,528.64 and 13,438.08

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Solution

The fourth proportional to 21,398.40, 29,528.64 and 13,438.08 is: 18,543.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,398.40 : 29,528.64 = 13,438.08 : x
  2. Step 2: Convert to fraction form
    21,398.40/29,528.64 = 13,438.08/x
  3. Step 3: Cross multiply
    21,398.40x = 29,528.64 × 13,438.08
  4. Step 4: Simplify right side
    21,398.40x = 396,808,226.61
  5. Step 5: Solve for x
    x = 396,808,226.61/21,398.40
  6. Step 6: Final answer
    x = 18,543.83

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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.