Home / 42,987.12-64,480.56-13,406.64

Finding the Fourth Proportional to 42,987.12, 64,480.56 and 13,406.64

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Solution

The fourth proportional to 42,987.12, 64,480.56 and 13,406.64 is: 20,109.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,987.12 : 64,480.56 = 13,406.64 : x
  2. Step 2: Convert to fraction form
    42,987.12/64,480.56 = 13,406.64/x
  3. Step 3: Cross multiply
    42,987.12x = 64,480.56 × 13,406.64
  4. Step 4: Simplify right side
    42,987.12x = 864,467,654.92
  5. Step 5: Solve for x
    x = 864,467,654.92/42,987.12
  6. Step 6: Final answer
    x = 20,109.92

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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.