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Finding the Fourth Proportional to 80,640.40, 120,701.40 and 57,312.40

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Solution

The fourth proportional to 80,640.40, 120,701.40 and 57,312.40 is: 85,784.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,640.40 : 120,701.40 = 57,312.40 : x
  2. Step 2: Convert to fraction form
    80,640.40/120,701.40 = 57,312.40/x
  3. Step 3: Cross multiply
    80,640.40x = 120,701.40 × 57,312.40
  4. Step 4: Simplify right side
    80,640.40x = 6,917,686,917.36
  5. Step 5: Solve for x
    x = 6,917,686,917.36/80,640.40
  6. Step 6: Final answer
    x = 85,784.38

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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.