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Finding the Fourth Proportional to 317,856.48, 438,639.82 and 172,660.94

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Solution

The fourth proportional to 317,856.48, 438,639.82 and 172,660.94 is: 238,270.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,856.48 : 438,639.82 = 172,660.94 : x
  2. Step 2: Convert to fraction form
    317,856.48/438,639.82 = 172,660.94/x
  3. Step 3: Cross multiply
    317,856.48x = 438,639.82 × 172,660.94
  4. Step 4: Simplify right side
    317,856.48x = 75,735,963,642.63
  5. Step 5: Solve for x
    x = 75,735,963,642.63/317,856.48
  6. Step 6: Final answer
    x = 238,270.94

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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.