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Finding the Fourth Proportional to 251,648, 377,530.32 and 85,436

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Solution

The fourth proportional to 251,648, 377,530.32 and 85,436 is: 128,173.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    251,648 : 377,530.32 = 85,436 : x
  2. Step 2: Convert to fraction form
    251,648/377,530.32 = 85,436/x
  3. Step 3: Cross multiply
    251,648x = 377,530.32 × 85,436
  4. Step 4: Simplify right side
    251,648x = 32,254,680,419.52
  5. Step 5: Solve for x
    x = 32,254,680,419.52/251,648
  6. Step 6: Final answer
    x = 128,173.80

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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.