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Finding the Fourth Proportional to 78,066.48, 117,099.90 and 18,901.92

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Solution

The fourth proportional to 78,066.48, 117,099.90 and 18,901.92 is: 28,352.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,066.48 : 117,099.90 = 18,901.92 : x
  2. Step 2: Convert to fraction form
    78,066.48/117,099.90 = 18,901.92/x
  3. Step 3: Cross multiply
    78,066.48x = 117,099.90 × 18,901.92
  4. Step 4: Simplify right side
    78,066.48x = 2,213,412,941.81
  5. Step 5: Solve for x
    x = 2,213,412,941.81/78,066.48
  6. Step 6: Final answer
    x = 28,352.92

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1.5x scale

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.