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Finding the Fourth Proportional to 78,999.66, 108,954.57 and 56,331.40

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Solution

The fourth proportional to 78,999.66, 108,954.57 and 56,331.40 is: 77,691.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,999.66 : 108,954.57 = 56,331.40 : x
  2. Step 2: Convert to fraction form
    78,999.66/108,954.57 = 56,331.40/x
  3. Step 3: Cross multiply
    78,999.66x = 108,954.57 × 56,331.40
  4. Step 4: Simplify right side
    78,999.66x = 6,137,563,464.50
  5. Step 5: Solve for x
    x = 6,137,563,464.50/78,999.66
  6. Step 6: Final answer
    x = 77,691.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.