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Finding the Fourth Proportional to 28,228, 42,483.80 and 21,244.20

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Solution

The fourth proportional to 28,228, 42,483.80 and 21,244.20 is: 31,973.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,228 : 42,483.80 = 21,244.20 : x
  2. Step 2: Convert to fraction form
    28,228/42,483.80 = 21,244.20/x
  3. Step 3: Cross multiply
    28,228x = 42,483.80 × 21,244.20
  4. Step 4: Simplify right side
    28,228x = 902,534,343.96
  5. Step 5: Solve for x
    x = 902,534,343.96/28,228
  6. Step 6: Final answer
    x = 31,973.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.