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Finding the Fourth Proportional to 78,663.99, 117,925.14 and 28,709.04

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Solution

The fourth proportional to 78,663.99, 117,925.14 and 28,709.04 is: 43,037.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,663.99 : 117,925.14 = 28,709.04 : x
  2. Step 2: Convert to fraction form
    78,663.99/117,925.14 = 28,709.04/x
  3. Step 3: Cross multiply
    78,663.99x = 117,925.14 × 28,709.04
  4. Step 4: Simplify right side
    78,663.99x = 3,385,517,698.74
  5. Step 5: Solve for x
    x = 3,385,517,698.74/78,663.99
  6. Step 6: Final answer
    x = 43,037.70

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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.