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Finding the Fourth Proportional to 720,199.12, 993,790.06 and 397,890

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Solution

The fourth proportional to 720,199.12, 993,790.06 and 397,890 is: 549,041.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,199.12 : 993,790.06 = 397,890 : x
  2. Step 2: Convert to fraction form
    720,199.12/993,790.06 = 397,890/x
  3. Step 3: Cross multiply
    720,199.12x = 993,790.06 × 397,890
  4. Step 4: Simplify right side
    720,199.12x = 395,419,126,973.40
  5. Step 5: Solve for x
    x = 395,419,126,973.40/720,199.12
  6. Step 6: Final answer
    x = 549,041.39

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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.