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Finding the Fourth Proportional to 85,271.40, 128,052.90 and 55,819.80

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Solution

The fourth proportional to 85,271.40, 128,052.90 and 55,819.80 is: 83,825.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,271.40 : 128,052.90 = 55,819.80 : x
  2. Step 2: Convert to fraction form
    85,271.40/128,052.90 = 55,819.80/x
  3. Step 3: Cross multiply
    85,271.40x = 128,052.90 × 55,819.80
  4. Step 4: Simplify right side
    85,271.40x = 7,147,887,267.42
  5. Step 5: Solve for x
    x = 7,147,887,267.42/85,271.40
  6. Step 6: Final answer
    x = 83,825.14

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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.