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Finding the Fourth Proportional to 85,855.64, 128,261.14 and 55,623.78

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Solution

The fourth proportional to 85,855.64, 128,261.14 and 55,623.78 is: 83,097.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,855.64 : 128,261.14 = 55,623.78 : x
  2. Step 2: Convert to fraction form
    85,855.64/128,261.14 = 55,623.78/x
  3. Step 3: Cross multiply
    85,855.64x = 128,261.14 × 55,623.78
  4. Step 4: Simplify right side
    85,855.64x = 7,134,369,294.85
  5. Step 5: Solve for x
    x = 7,134,369,294.85/85,855.64
  6. Step 6: Final answer
    x = 83,097.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.