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Finding the Fourth Proportional to 85,512.30, 128,122.65 and 70,640.70

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Solution

The fourth proportional to 85,512.30, 128,122.65 and 70,640.70 is: 105,840.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,512.30 : 128,122.65 = 70,640.70 : x
  2. Step 2: Convert to fraction form
    85,512.30/128,122.65 = 70,640.70/x
  3. Step 3: Cross multiply
    85,512.30x = 128,122.65 × 70,640.70
  4. Step 4: Simplify right side
    85,512.30x = 9,050,673,681.86
  5. Step 5: Solve for x
    x = 9,050,673,681.86/85,512.30
  6. Step 6: Final answer
    x = 105,840.61

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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.