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Finding the Fourth Proportional to 720,214.26, 993,915.72 and 397,945.12

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Solution

The fourth proportional to 720,214.26, 993,915.72 and 397,945.12 is: 549,175.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,214.26 : 993,915.72 = 397,945.12 : x
  2. Step 2: Convert to fraction form
    720,214.26/993,915.72 = 397,945.12/x
  3. Step 3: Cross multiply
    720,214.26x = 993,915.72 × 397,945.12
  4. Step 4: Simplify right side
    720,214.26x = 395,523,910,465.29
  5. Step 5: Solve for x
    x = 395,523,910,465.29/720,214.26
  6. Step 6: Final answer
    x = 549,175.34

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Double scale
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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.