Home / 121,138.90-181,643.55-42,255.70

Finding the Fourth Proportional to 121,138.90, 181,643.55 and 42,255.70

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Solution

The fourth proportional to 121,138.90, 181,643.55 and 42,255.70 is: 63,360.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,138.90 : 181,643.55 = 42,255.70 : x
  2. Step 2: Convert to fraction form
    121,138.90/181,643.55 = 42,255.70/x
  3. Step 3: Cross multiply
    121,138.90x = 181,643.55 × 42,255.70
  4. Step 4: Simplify right side
    121,138.90x = 7,675,475,355.74
  5. Step 5: Solve for x
    x = 7,675,475,355.74/121,138.90
  6. Step 6: Final answer
    x = 63,360.95

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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.