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Finding the Fourth Proportional to 103,129.45, 142,325.22 and 57,807.45

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Solution

The fourth proportional to 103,129.45, 142,325.22 and 57,807.45 is: 79,777.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,129.45 : 142,325.22 = 57,807.45 : x
  2. Step 2: Convert to fraction form
    103,129.45/142,325.22 = 57,807.45/x
  3. Step 3: Cross multiply
    103,129.45x = 142,325.22 × 57,807.45
  4. Step 4: Simplify right side
    103,129.45x = 8,227,457,182.74
  5. Step 5: Solve for x
    x = 8,227,457,182.74/103,129.45
  6. Step 6: Final answer
    x = 79,777.96

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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.