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Finding the Fourth Proportional to 720,209.57, 993,862.40 and 397,912.77

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Solution

The fourth proportional to 720,209.57, 993,862.40 and 397,912.77 is: 549,104.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,209.57 : 993,862.40 = 397,912.77 : x
  2. Step 2: Convert to fraction form
    720,209.57/993,862.40 = 397,912.77/x
  3. Step 3: Cross multiply
    720,209.57x = 993,862.40 × 397,912.77
  4. Step 4: Simplify right side
    720,209.57x = 395,470,538,593.28
  5. Step 5: Solve for x
    x = 395,470,538,593.28/720,209.57
  6. Step 6: Final answer
    x = 549,104.81

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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.