Home / 21,036.80-29,230-20,817.44

Finding the Fourth Proportional to 21,036.80, 29,230 and 20,817.44

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Solution

The fourth proportional to 21,036.80, 29,230 and 20,817.44 is: 28,925.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,036.80 : 29,230 = 20,817.44 : x
  2. Step 2: Convert to fraction form
    21,036.80/29,230 = 20,817.44/x
  3. Step 3: Cross multiply
    21,036.80x = 29,230 × 20,817.44
  4. Step 4: Simplify right side
    21,036.80x = 608,493,771.20
  5. Step 5: Solve for x
    x = 608,493,771.20/21,036.80
  6. Step 6: Final answer
    x = 28,925.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.