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Finding the Fourth Proportional to 105,585.50, 145,708.01 and 57,840.55

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Solution

The fourth proportional to 105,585.50, 145,708.01 and 57,840.55 is: 79,819.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,585.50 : 145,708.01 = 57,840.55 : x
  2. Step 2: Convert to fraction form
    105,585.50/145,708.01 = 57,840.55/x
  3. Step 3: Cross multiply
    105,585.50x = 145,708.01 × 57,840.55
  4. Step 4: Simplify right side
    105,585.50x = 8,427,831,218.14
  5. Step 5: Solve for x
    x = 8,427,831,218.14/105,585.50
  6. Step 6: Final answer
    x = 79,819.97

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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.