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Finding the Fourth Proportional to 78,477.98, 117,790.95 and 28,606.28

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Solution

The fourth proportional to 78,477.98, 117,790.95 and 28,606.28 is: 42,936.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,477.98 : 117,790.95 = 28,606.28 : x
  2. Step 2: Convert to fraction form
    78,477.98/117,790.95 = 28,606.28/x
  3. Step 3: Cross multiply
    78,477.98x = 117,790.95 × 28,606.28
  4. Step 4: Simplify right side
    78,477.98x = 3,369,560,897.17
  5. Step 5: Solve for x
    x = 3,369,560,897.17/78,477.98
  6. Step 6: Final answer
    x = 42,936.39

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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.