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Finding the Fourth Proportional to 120,985.40, 181,259.40 and 103,489.40

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Solution

The fourth proportional to 120,985.40, 181,259.40 and 103,489.40 is: 155,047.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,985.40 : 181,259.40 = 103,489.40 : x
  2. Step 2: Convert to fraction form
    120,985.40/181,259.40 = 103,489.40/x
  3. Step 3: Cross multiply
    120,985.40x = 181,259.40 × 103,489.40
  4. Step 4: Simplify right side
    120,985.40x = 18,758,426,550.36
  5. Step 5: Solve for x
    x = 18,758,426,550.36/120,985.40
  6. Step 6: Final answer
    x = 155,047.03

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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.