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Finding the Fourth Proportional to 85,405.35, 128,186.40 and 43,314.72

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Solution

The fourth proportional to 85,405.35, 128,186.40 and 43,314.72 is: 65,011.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,405.35 : 128,186.40 = 43,314.72 : x
  2. Step 2: Convert to fraction form
    85,405.35/128,186.40 = 43,314.72/x
  3. Step 3: Cross multiply
    85,405.35x = 128,186.40 × 43,314.72
  4. Step 4: Simplify right side
    85,405.35x = 5,552,358,023.81
  5. Step 5: Solve for x
    x = 5,552,358,023.81/85,405.35
  6. Step 6: Final answer
    x = 65,011.83

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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.