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Finding the Fourth Proportional to 121,238.60, 181,814.70 and 42,355.40

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Solution

The fourth proportional to 121,238.60, 181,814.70 and 42,355.40 is: 63,518.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,238.60 : 181,814.70 = 42,355.40 : x
  2. Step 2: Convert to fraction form
    121,238.60/181,814.70 = 42,355.40/x
  3. Step 3: Cross multiply
    121,238.60x = 181,814.70 × 42,355.40
  4. Step 4: Simplify right side
    121,238.60x = 7,700,834,344.38
  5. Step 5: Solve for x
    x = 7,700,834,344.38/121,238.60
  6. Step 6: Final answer
    x = 63,518.01

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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.