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Finding the Fourth Proportional to 426,915.05, 640,329.64 and 111,372.53

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Solution

The fourth proportional to 426,915.05, 640,329.64 and 111,372.53 is: 167,047.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,915.05 : 640,329.64 = 111,372.53 : x
  2. Step 2: Convert to fraction form
    426,915.05/640,329.64 = 111,372.53/x
  3. Step 3: Cross multiply
    426,915.05x = 640,329.64 × 111,372.53
  4. Step 4: Simplify right side
    426,915.05x = 71,315,128,560.71
  5. Step 5: Solve for x
    x = 71,315,128,560.71/426,915.05
  6. Step 6: Final answer
    x = 167,047.59

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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.