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Finding the Fourth Proportional to 85,642.45, 128,423.10 and 25,647.83

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Solution

The fourth proportional to 85,642.45, 128,423.10 and 25,647.83 is: 38,459.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,642.45 : 128,423.10 = 25,647.83 : x
  2. Step 2: Convert to fraction form
    85,642.45/128,423.10 = 25,647.83/x
  3. Step 3: Cross multiply
    85,642.45x = 128,423.10 × 25,647.83
  4. Step 4: Simplify right side
    85,642.45x = 3,293,773,836.87
  5. Step 5: Solve for x
    x = 3,293,773,836.87/85,642.45
  6. Step 6: Final answer
    x = 38,459.59

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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.