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Finding the Fourth Proportional to 85,365.40, 128,048.10 and 80,991.40

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Solution

The fourth proportional to 85,365.40, 128,048.10 and 80,991.40 is: 121,487.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,365.40 : 128,048.10 = 80,991.40 : x
  2. Step 2: Convert to fraction form
    85,365.40/128,048.10 = 80,991.40/x
  3. Step 3: Cross multiply
    85,365.40x = 128,048.10 × 80,991.40
  4. Step 4: Simplify right side
    85,365.40x = 10,370,794,886.34
  5. Step 5: Solve for x
    x = 10,370,794,886.34/85,365.40
  6. Step 6: Final answer
    x = 121,487.10

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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.