Home / 260,128.30-390,192.45-73,139.80

Finding the Fourth Proportional to 260,128.30, 390,192.45 and 73,139.80

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Solution

The fourth proportional to 260,128.30, 390,192.45 and 73,139.80 is: 109,709.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,128.30 : 390,192.45 = 73,139.80 : x
  2. Step 2: Convert to fraction form
    260,128.30/390,192.45 = 73,139.80/x
  3. Step 3: Cross multiply
    260,128.30x = 390,192.45 × 73,139.80
  4. Step 4: Simplify right side
    260,128.30x = 28,538,597,754.51
  5. Step 5: Solve for x
    x = 28,538,597,754.51/260,128.30
  6. Step 6: Final answer
    x = 109,709.70

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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.