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Finding the Fourth Proportional to 78,102.99, 117,155.94 and 28,186.83

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Solution

The fourth proportional to 78,102.99, 117,155.94 and 28,186.83 is: 42,280.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,102.99 : 117,155.94 = 28,186.83 : x
  2. Step 2: Convert to fraction form
    78,102.99/117,155.94 = 28,186.83/x
  3. Step 3: Cross multiply
    78,102.99x = 117,155.94 × 28,186.83
  4. Step 4: Simplify right side
    78,102.99x = 3,302,254,564.27
  5. Step 5: Solve for x
    x = 3,302,254,564.27/78,102.99
  6. Step 6: Final answer
    x = 42,280.77

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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.