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Finding the Fourth Proportional to 426,913.92, 640,327.95 and 111,371.40

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Solution

The fourth proportional to 426,913.92, 640,327.95 and 111,371.40 is: 167,045.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,913.92 : 640,327.95 = 111,371.40 : x
  2. Step 2: Convert to fraction form
    426,913.92/640,327.95 = 111,371.40/x
  3. Step 3: Cross multiply
    426,913.92x = 640,327.95 × 111,371.40
  4. Step 4: Simplify right side
    426,913.92x = 71,314,220,250.63
  5. Step 5: Solve for x
    x = 71,314,220,250.63/426,913.92
  6. Step 6: Final answer
    x = 167,045.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.