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Finding the Fourth Proportional to 121,143.40, 181,715.10 and 42,231.40

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Solution

The fourth proportional to 121,143.40, 181,715.10 and 42,231.40 is: 63,347.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,143.40 : 181,715.10 = 42,231.40 : x
  2. Step 2: Convert to fraction form
    121,143.40/181,715.10 = 42,231.40/x
  3. Step 3: Cross multiply
    121,143.40x = 181,715.10 × 42,231.40
  4. Step 4: Simplify right side
    121,143.40x = 7,674,083,074.14
  5. Step 5: Solve for x
    x = 7,674,083,074.14/121,143.40
  6. Step 6: Final answer
    x = 63,347.10

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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.