Home / 28,739.90-39,649.80-21,204.32

Finding the Fourth Proportional to 28,739.90, 39,649.80 and 21,204.32

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Solution

The fourth proportional to 28,739.90, 39,649.80 and 21,204.32 is: 29,253.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,739.90 : 39,649.80 = 21,204.32 : x
  2. Step 2: Convert to fraction form
    28,739.90/39,649.80 = 21,204.32/x
  3. Step 3: Cross multiply
    28,739.90x = 39,649.80 × 21,204.32
  4. Step 4: Simplify right side
    28,739.90x = 840,746,848.89
  5. Step 5: Solve for x
    x = 840,746,848.89/28,739.90
  6. Step 6: Final answer
    x = 29,253.65

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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.