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Finding the Fourth Proportional to 318,053.79, 438,906.87 and 172,856.16

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Solution

The fourth proportional to 318,053.79, 438,906.87 and 172,856.16 is: 238,537.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,053.79 : 438,906.87 = 172,856.16 : x
  2. Step 2: Convert to fraction form
    318,053.79/438,906.87 = 172,856.16/x
  3. Step 3: Cross multiply
    318,053.79x = 438,906.87 × 172,856.16
  4. Step 4: Simplify right side
    318,053.79x = 75,867,756,145.82
  5. Step 5: Solve for x
    x = 75,867,756,145.82/318,053.79
  6. Step 6: Final answer
    x = 238,537.50

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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.