Home / 30,661.20-42,314.40-20,079.36

Finding the Fourth Proportional to 30,661.20, 42,314.40 and 20,079.36

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Solution

The fourth proportional to 30,661.20, 42,314.40 and 20,079.36 is: 27,710.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,661.20 : 42,314.40 = 20,079.36 : x
  2. Step 2: Convert to fraction form
    30,661.20/42,314.40 = 20,079.36/x
  3. Step 3: Cross multiply
    30,661.20x = 42,314.40 × 20,079.36
  4. Step 4: Simplify right side
    30,661.20x = 849,646,070.78
  5. Step 5: Solve for x
    x = 849,646,070.78/30,661.20
  6. Step 6: Final answer
    x = 27,710.79

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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.