Home / 21,309.28-29,410.64-13,358.40

Finding the Fourth Proportional to 21,309.28, 29,410.64 and 13,358.40

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Solution

The fourth proportional to 21,309.28, 29,410.64 and 13,358.40 is: 18,437.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,309.28 : 29,410.64 = 13,358.40 : x
  2. Step 2: Convert to fraction form
    21,309.28/29,410.64 = 13,358.40/x
  3. Step 3: Cross multiply
    21,309.28x = 29,410.64 × 13,358.40
  4. Step 4: Simplify right side
    21,309.28x = 392,879,093.38
  5. Step 5: Solve for x
    x = 392,879,093.38/21,309.28
  6. Step 6: Final answer
    x = 18,437.00

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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.