Home / 21,240.80-29,312.40-13,287.68

Finding the Fourth Proportional to 21,240.80, 29,312.40 and 13,287.68

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Solution

The fourth proportional to 21,240.80, 29,312.40 and 13,287.68 is: 18,337.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,240.80 : 29,312.40 = 13,287.68 : x
  2. Step 2: Convert to fraction form
    21,240.80/29,312.40 = 13,287.68/x
  3. Step 3: Cross multiply
    21,240.80x = 29,312.40 × 13,287.68
  4. Step 4: Simplify right side
    21,240.80x = 389,493,791.23
  5. Step 5: Solve for x
    x = 389,493,791.23/21,240.80
  6. Step 6: Final answer
    x = 18,337.06

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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.