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Finding the Fourth Proportional to 121,120.90, 181,681.35 and 74,464.90

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Solution

The fourth proportional to 121,120.90, 181,681.35 and 74,464.90 is: 111,697.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,120.90 : 181,681.35 = 74,464.90 : x
  2. Step 2: Convert to fraction form
    121,120.90/181,681.35 = 74,464.90/x
  3. Step 3: Cross multiply
    121,120.90x = 181,681.35 × 74,464.90
  4. Step 4: Simplify right side
    121,120.90x = 13,528,883,559.62
  5. Step 5: Solve for x
    x = 13,528,883,559.62/121,120.90
  6. Step 6: Final answer
    x = 111,697.35

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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.