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Finding the Fourth Proportional to 121,170.40, 181,809.60 and 42,341.20

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Solution

The fourth proportional to 121,170.40, 181,809.60 and 42,341.20 is: 63,530.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,170.40 : 181,809.60 = 42,341.20 : x
  2. Step 2: Convert to fraction form
    121,170.40/181,809.60 = 42,341.20/x
  3. Step 3: Cross multiply
    121,170.40x = 181,809.60 × 42,341.20
  4. Step 4: Simplify right side
    121,170.40x = 7,698,036,635.52
  5. Step 5: Solve for x
    x = 7,698,036,635.52/121,170.40
  6. Step 6: Final answer
    x = 63,530.67

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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.