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Finding the Fourth Proportional to 78,622.47, 117,828.61 and 28,655.60

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Solution

The fourth proportional to 78,622.47, 117,828.61 and 28,655.60 is: 42,945.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,622.47 : 117,828.61 = 28,655.60 : x
  2. Step 2: Convert to fraction form
    78,622.47/117,828.61 = 28,655.60/x
  3. Step 3: Cross multiply
    78,622.47x = 117,828.61 × 28,655.60
  4. Step 4: Simplify right side
    78,622.47x = 3,376,448,855.93
  5. Step 5: Solve for x
    x = 3,376,448,855.93/78,622.47
  6. Step 6: Final answer
    x = 42,945.09

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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.