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Finding the Fourth Proportional to 309,390.60, 426,978.75 and 173,424.57

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Solution

The fourth proportional to 309,390.60, 426,978.75 and 173,424.57 is: 239,336.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,390.60 : 426,978.75 = 173,424.57 : x
  2. Step 2: Convert to fraction form
    309,390.60/426,978.75 = 173,424.57/x
  3. Step 3: Cross multiply
    309,390.60x = 426,978.75 × 173,424.57
  4. Step 4: Simplify right side
    309,390.60x = 74,048,606,117.89
  5. Step 5: Solve for x
    x = 74,048,606,117.89/309,390.60
  6. Step 6: Final answer
    x = 239,336.96

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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.