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Finding the Fourth Proportional to 317,420.81, 438,040.09 and 172,226.54

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Solution

The fourth proportional to 317,420.81, 438,040.09 and 172,226.54 is: 237,672.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,420.81 : 438,040.09 = 172,226.54 : x
  2. Step 2: Convert to fraction form
    317,420.81/438,040.09 = 172,226.54/x
  3. Step 3: Cross multiply
    317,420.81x = 438,040.09 × 172,226.54
  4. Step 4: Simplify right side
    317,420.81x = 75,442,130,715.30
  5. Step 5: Solve for x
    x = 75,442,130,715.30/317,420.81
  6. Step 6: Final answer
    x = 237,672.29

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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.