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Finding the Fourth Proportional to 85,820.80, 128,731.20 and 85,820.80

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Solution

The fourth proportional to 85,820.80, 128,731.20 and 85,820.80 is: 128,731.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,820.80 : 128,731.20 = 85,820.80 : x
  2. Step 2: Convert to fraction form
    85,820.80/128,731.20 = 85,820.80/x
  3. Step 3: Cross multiply
    85,820.80x = 128,731.20 × 85,820.80
  4. Step 4: Simplify right side
    85,820.80x = 11,047,814,568.96
  5. Step 5: Solve for x
    x = 11,047,814,568.96/85,820.80
  6. Step 6: Final answer
    x = 128,731.20

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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.