Home / 142,023.12-195,989.64-78,360.72

Finding the Fourth Proportional to 142,023.12, 195,989.64 and 78,360.72

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Solution

The fourth proportional to 142,023.12, 195,989.64 and 78,360.72 is: 108,136.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,023.12 : 195,989.64 = 78,360.72 : x
  2. Step 2: Convert to fraction form
    142,023.12/195,989.64 = 78,360.72/x
  3. Step 3: Cross multiply
    142,023.12x = 195,989.64 × 78,360.72
  4. Step 4: Simplify right side
    142,023.12x = 15,357,889,302.94
  5. Step 5: Solve for x
    x = 15,357,889,302.94/142,023.12
  6. Step 6: Final answer
    x = 108,136.54

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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.