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Finding the Fourth Proportional to 720,003.90, 1,080,005.85 and 533,379.90

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Solution

The fourth proportional to 720,003.90, 1,080,005.85 and 533,379.90 is: 800,069.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,003.90 : 1,080,005.85 = 533,379.90 : x
  2. Step 2: Convert to fraction form
    720,003.90/1,080,005.85 = 533,379.90/x
  3. Step 3: Cross multiply
    720,003.90x = 1,080,005.85 × 533,379.90
  4. Step 4: Simplify right side
    720,003.90x = 576,053,412,272.42
  5. Step 5: Solve for x
    x = 576,053,412,272.42/720,003.90
  6. Step 6: Final answer
    x = 800,069.85

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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.