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Finding the Fourth Proportional to 145,856.70, 218,785.05 and 85,823.55

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Solution

The fourth proportional to 145,856.70, 218,785.05 and 85,823.55 is: 128,735.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,856.70 : 218,785.05 = 85,823.55 : x
  2. Step 2: Convert to fraction form
    145,856.70/218,785.05 = 85,823.55/x
  3. Step 3: Cross multiply
    145,856.70x = 218,785.05 × 85,823.55
  4. Step 4: Simplify right side
    145,856.70x = 18,776,909,677.93
  5. Step 5: Solve for x
    x = 18,776,909,677.93/145,856.70
  6. Step 6: Final answer
    x = 128,735.33

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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.