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Finding the Fourth Proportional to 28,263.79, 38,978.60 and 21,111.04

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Solution

The fourth proportional to 28,263.79, 38,978.60 and 21,111.04 is: 29,114.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,263.79 : 38,978.60 = 21,111.04 : x
  2. Step 2: Convert to fraction form
    28,263.79/38,978.60 = 21,111.04/x
  3. Step 3: Cross multiply
    28,263.79x = 38,978.60 × 21,111.04
  4. Step 4: Simplify right side
    28,263.79x = 822,878,989.54
  5. Step 5: Solve for x
    x = 822,878,989.54/28,263.79
  6. Step 6: Final answer
    x = 29,114.25

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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.