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Finding the Fourth Proportional to 4,751.84, 7,128.12 and 1,289

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Solution

The fourth proportional to 4,751.84, 7,128.12 and 1,289 is: 1,933.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,751.84 : 7,128.12 = 1,289 : x
  2. Step 2: Convert to fraction form
    4,751.84/7,128.12 = 1,289/x
  3. Step 3: Cross multiply
    4,751.84x = 7,128.12 × 1,289
  4. Step 4: Simplify right side
    4,751.84x = 9,188,146.68
  5. Step 5: Solve for x
    x = 9,188,146.68/4,751.84
  6. Step 6: Final answer
    x = 1,933.60

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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.