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Finding the Fourth Proportional to 315,216.78, 435,000.60 and 171,979.80

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Solution

The fourth proportional to 315,216.78, 435,000.60 and 171,979.80 is: 237,332.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,216.78 : 435,000.60 = 171,979.80 : x
  2. Step 2: Convert to fraction form
    315,216.78/435,000.60 = 171,979.80/x
  3. Step 3: Cross multiply
    315,216.78x = 435,000.60 × 171,979.80
  4. Step 4: Simplify right side
    315,216.78x = 74,811,316,187.88
  5. Step 5: Solve for x
    x = 74,811,316,187.88/315,216.78
  6. Step 6: Final answer
    x = 237,332.91

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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.