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Finding the Fourth Proportional to 38,269.80, 52,820.88 and 21,280

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Solution

The fourth proportional to 38,269.80, 52,820.88 and 21,280 is: 29,371.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,269.80 : 52,820.88 = 21,280 : x
  2. Step 2: Convert to fraction form
    38,269.80/52,820.88 = 21,280/x
  3. Step 3: Cross multiply
    38,269.80x = 52,820.88 × 21,280
  4. Step 4: Simplify right side
    38,269.80x = 1,124,028,326.40
  5. Step 5: Solve for x
    x = 1,124,028,326.40/38,269.80
  6. Step 6: Final answer
    x = 29,371.16

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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.