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Finding the Fourth Proportional to 120,999.40, 181,499.10 and 42,087.40

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Solution

The fourth proportional to 120,999.40, 181,499.10 and 42,087.40 is: 63,131.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,999.40 : 181,499.10 = 42,087.40 : x
  2. Step 2: Convert to fraction form
    120,999.40/181,499.10 = 42,087.40/x
  3. Step 3: Cross multiply
    120,999.40x = 181,499.10 × 42,087.40
  4. Step 4: Simplify right side
    120,999.40x = 7,638,825,221.34
  5. Step 5: Solve for x
    x = 7,638,825,221.34/120,999.40
  6. Step 6: Final answer
    x = 63,131.10

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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.