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Finding the Fourth Proportional to 720,072.55, 993,663.40 and 397,720.30

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Solution

The fourth proportional to 720,072.55, 993,663.40 and 397,720.30 is: 548,833.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,072.55 : 993,663.40 = 397,720.30 : x
  2. Step 2: Convert to fraction form
    720,072.55/993,663.40 = 397,720.30/x
  3. Step 3: Cross multiply
    720,072.55x = 993,663.40 × 397,720.30
  4. Step 4: Simplify right side
    720,072.55x = 395,200,105,547.02
  5. Step 5: Solve for x
    x = 395,200,105,547.02/720,072.55
  6. Step 6: Final answer
    x = 548,833.73

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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.