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Finding the Fourth Proportional to 85,886.10, 128,829.15 and 74,076.30

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Solution

The fourth proportional to 85,886.10, 128,829.15 and 74,076.30 is: 111,114.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,886.10 : 128,829.15 = 74,076.30 : x
  2. Step 2: Convert to fraction form
    85,886.10/128,829.15 = 74,076.30/x
  3. Step 3: Cross multiply
    85,886.10x = 128,829.15 × 74,076.30
  4. Step 4: Simplify right side
    85,886.10x = 9,543,186,764.15
  5. Step 5: Solve for x
    x = 9,543,186,764.15/85,886.10
  6. Step 6: Final answer
    x = 111,114.45

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1.5x scale

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.