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Finding the Fourth Proportional to 85,267.79, 128,181.89 and 79,102.16

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Solution

The fourth proportional to 85,267.79, 128,181.89 and 79,102.16 is: 118,913.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,267.79 : 128,181.89 = 79,102.16 : x
  2. Step 2: Convert to fraction form
    85,267.79/128,181.89 = 79,102.16/x
  3. Step 3: Cross multiply
    85,267.79x = 128,181.89 × 79,102.16
  4. Step 4: Simplify right side
    85,267.79x = 10,139,464,409.41
  5. Step 5: Solve for x
    x = 10,139,464,409.41/85,267.79
  6. Step 6: Final answer
    x = 118,913.19

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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.