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Finding the Fourth Proportional to 1,875.20, 2,812.55 and 488.64

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Solution

The fourth proportional to 1,875.20, 2,812.55 and 488.64 is: 732.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,875.20 : 2,812.55 = 488.64 : x
  2. Step 2: Convert to fraction form
    1,875.20/2,812.55 = 488.64/x
  3. Step 3: Cross multiply
    1,875.20x = 2,812.55 × 488.64
  4. Step 4: Simplify right side
    1,875.20x = 1,374,324.43
  5. Step 5: Solve for x
    x = 1,374,324.43/1,875.20
  6. Step 6: Final answer
    x = 732.89

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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.