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Finding the Fourth Proportional to 121,018.60, 181,484.70 and 42,135.40

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Solution

The fourth proportional to 121,018.60, 181,484.70 and 42,135.40 is: 63,188.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,018.60 : 181,484.70 = 42,135.40 : x
  2. Step 2: Convert to fraction form
    121,018.60/181,484.70 = 42,135.40/x
  3. Step 3: Cross multiply
    121,018.60x = 181,484.70 × 42,135.40
  4. Step 4: Simplify right side
    121,018.60x = 7,646,930,428.38
  5. Step 5: Solve for x
    x = 7,646,930,428.38/121,018.60
  6. Step 6: Final answer
    x = 63,188.06

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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.