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Finding the Fourth Proportional to 720,147.72, 993,823.92 and 397,878.60

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Solution

The fourth proportional to 720,147.72, 993,823.92 and 397,878.60 is: 549,083.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,147.72 : 993,823.92 = 397,878.60 : x
  2. Step 2: Convert to fraction form
    720,147.72/993,823.92 = 397,878.60/x
  3. Step 3: Cross multiply
    720,147.72x = 993,823.92 × 397,878.60
  4. Step 4: Simplify right side
    720,147.72x = 395,421,269,936.11
  5. Step 5: Solve for x
    x = 395,421,269,936.11/720,147.72
  6. Step 6: Final answer
    x = 549,083.55

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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.