Home / 78,419.12-117,557.37-28,477.76

Finding the Fourth Proportional to 78,419.12, 117,557.37 and 28,477.76

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Solution

The fourth proportional to 78,419.12, 117,557.37 and 28,477.76 is: 42,690.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,419.12 : 117,557.37 = 28,477.76 : x
  2. Step 2: Convert to fraction form
    78,419.12/117,557.37 = 28,477.76/x
  3. Step 3: Cross multiply
    78,419.12x = 117,557.37 × 28,477.76
  4. Step 4: Simplify right side
    78,419.12x = 3,347,769,981.30
  5. Step 5: Solve for x
    x = 3,347,769,981.30/78,419.12
  6. Step 6: Final answer
    x = 42,690.74

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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.