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Finding the Fourth Proportional to 42,815.60, 64,223.40 and 41,940.80

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Solution

The fourth proportional to 42,815.60, 64,223.40 and 41,940.80 is: 62,911.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,815.60 : 64,223.40 = 41,940.80 : x
  2. Step 2: Convert to fraction form
    42,815.60/64,223.40 = 41,940.80/x
  3. Step 3: Cross multiply
    42,815.60x = 64,223.40 × 41,940.80
  4. Step 4: Simplify right side
    42,815.60x = 2,693,580,774.72
  5. Step 5: Solve for x
    x = 2,693,580,774.72/42,815.60
  6. Step 6: Final answer
    x = 62,911.20

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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.