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Finding the Fourth Proportional to 85,392.13, 128,000.70 and 35,501.20

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Solution

The fourth proportional to 85,392.13, 128,000.70 and 35,501.20 is: 53,215.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,392.13 : 128,000.70 = 35,501.20 : x
  2. Step 2: Convert to fraction form
    85,392.13/128,000.70 = 35,501.20/x
  3. Step 3: Cross multiply
    85,392.13x = 128,000.70 × 35,501.20
  4. Step 4: Simplify right side
    85,392.13x = 4,544,178,450.84
  5. Step 5: Solve for x
    x = 4,544,178,450.84/85,392.13
  6. Step 6: Final answer
    x = 53,215.42

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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.