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Finding the Fourth Proportional to 42,645.60, 63,968.40 and 20,455.20

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Solution

The fourth proportional to 42,645.60, 63,968.40 and 20,455.20 is: 30,682.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,645.60 : 63,968.40 = 20,455.20 : x
  2. Step 2: Convert to fraction form
    42,645.60/63,968.40 = 20,455.20/x
  3. Step 3: Cross multiply
    42,645.60x = 63,968.40 × 20,455.20
  4. Step 4: Simplify right side
    42,645.60x = 1,308,486,415.68
  5. Step 5: Solve for x
    x = 1,308,486,415.68/42,645.60
  6. Step 6: Final answer
    x = 30,682.80

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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.