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Finding the Fourth Proportional to 309,390.10, 426,978.06 and 173,424.08

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Solution

The fourth proportional to 309,390.10, 426,978.06 and 173,424.08 is: 239,336.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,390.10 : 426,978.06 = 173,424.08 : x
  2. Step 2: Convert to fraction form
    309,390.10/426,978.06 = 173,424.08/x
  3. Step 3: Cross multiply
    309,390.10x = 426,978.06 × 173,424.08
  4. Step 4: Simplify right side
    309,390.10x = 74,048,277,235.68
  5. Step 5: Solve for x
    x = 74,048,277,235.68/309,390.10
  6. Step 6: Final answer
    x = 239,336.29

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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.