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Finding the Fourth Proportional to 100,612.45, 138,762.79 and 62,345.42

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Solution

The fourth proportional to 100,612.45, 138,762.79 and 62,345.42 is: 85,985.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,612.45 : 138,762.79 = 62,345.42 : x
  2. Step 2: Convert to fraction form
    100,612.45/138,762.79 = 62,345.42/x
  3. Step 3: Cross multiply
    100,612.45x = 138,762.79 × 62,345.42
  4. Step 4: Simplify right side
    100,612.45x = 8,651,224,093.60
  5. Step 5: Solve for x
    x = 8,651,224,093.60/100,612.45
  6. Step 6: Final answer
    x = 85,985.62

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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.