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Finding the Fourth Proportional to 21,053.84, 29,055.88 and 20,399.48

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Solution

The fourth proportional to 21,053.84, 29,055.88 and 20,399.48 is: 28,152.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,053.84 : 29,055.88 = 20,399.48 : x
  2. Step 2: Convert to fraction form
    21,053.84/29,055.88 = 20,399.48/x
  3. Step 3: Cross multiply
    21,053.84x = 29,055.88 × 20,399.48
  4. Step 4: Simplify right side
    21,053.84x = 592,724,842.94
  5. Step 5: Solve for x
    x = 592,724,842.94/21,053.84
  6. Step 6: Final answer
    x = 28,152.81

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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.