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Finding the Fourth Proportional to 42,015.40, 63,023.10 and 21,020.20

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Solution

The fourth proportional to 42,015.40, 63,023.10 and 21,020.20 is: 31,530.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,015.40 : 63,023.10 = 21,020.20 : x
  2. Step 2: Convert to fraction form
    42,015.40/63,023.10 = 21,020.20/x
  3. Step 3: Cross multiply
    42,015.40x = 63,023.10 × 21,020.20
  4. Step 4: Simplify right side
    42,015.40x = 1,324,758,166.62
  5. Step 5: Solve for x
    x = 1,324,758,166.62/42,015.40
  6. Step 6: Final answer
    x = 31,530.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.