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Finding the Fourth Proportional to 85,818.55, 128,560.24 and 40,775.81

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Solution

The fourth proportional to 85,818.55, 128,560.24 and 40,775.81 is: 61,084.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,818.55 : 128,560.24 = 40,775.81 : x
  2. Step 2: Convert to fraction form
    85,818.55/128,560.24 = 40,775.81/x
  3. Step 3: Cross multiply
    85,818.55x = 128,560.24 × 40,775.81
  4. Step 4: Simplify right side
    85,818.55x = 5,242,147,276.99
  5. Step 5: Solve for x
    x = 5,242,147,276.99/85,818.55
  6. Step 6: Final answer
    x = 61,084.08

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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.