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Finding the Fourth Proportional to 78,878.77, 117,714.46 and 70,464.28

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Solution

The fourth proportional to 78,878.77, 117,714.46 and 70,464.28 is: 105,157.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,878.77 : 117,714.46 = 70,464.28 : x
  2. Step 2: Convert to fraction form
    78,878.77/117,714.46 = 70,464.28/x
  3. Step 3: Cross multiply
    78,878.77x = 117,714.46 × 70,464.28
  4. Step 4: Simplify right side
    78,878.77x = 8,294,664,669.49
  5. Step 5: Solve for x
    x = 8,294,664,669.49/78,878.77
  6. Step 6: Final answer
    x = 105,157.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.