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Finding the Fourth Proportional to 121,228.90, 181,843.35 and 68,740.90

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Solution

The fourth proportional to 121,228.90, 181,843.35 and 68,740.90 is: 103,111.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,228.90 : 181,843.35 = 68,740.90 : x
  2. Step 2: Convert to fraction form
    121,228.90/181,843.35 = 68,740.90/x
  3. Step 3: Cross multiply
    121,228.90x = 181,843.35 × 68,740.90
  4. Step 4: Simplify right side
    121,228.90x = 12,500,075,538.02
  5. Step 5: Solve for x
    x = 12,500,075,538.02/121,228.90
  6. Step 6: Final answer
    x = 103,111.35

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1.5x scale

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.