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Finding the Fourth Proportional to 315,658.20, 435,618.78 and 172,431.60

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Solution

The fourth proportional to 315,658.20, 435,618.78 and 172,431.60 is: 237,961.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,658.20 : 435,618.78 = 172,431.60 : x
  2. Step 2: Convert to fraction form
    315,658.20/435,618.78 = 172,431.60/x
  3. Step 3: Cross multiply
    315,658.20x = 435,618.78 × 172,431.60
  4. Step 4: Simplify right side
    315,658.20x = 75,114,443,225.45
  5. Step 5: Solve for x
    x = 75,114,443,225.45/315,658.20
  6. Step 6: Final answer
    x = 237,961.32

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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.