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Finding the Fourth Proportional to 1,812.45, 2,719.36 and 642.40

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Solution

The fourth proportional to 1,812.45, 2,719.36 and 642.40 is: 963.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,812.45 : 2,719.36 = 642.40 : x
  2. Step 2: Convert to fraction form
    1,812.45/2,719.36 = 642.40/x
  3. Step 3: Cross multiply
    1,812.45x = 2,719.36 × 642.40
  4. Step 4: Simplify right side
    1,812.45x = 1,746,916.86
  5. Step 5: Solve for x
    x = 1,746,916.86/1,812.45
  6. Step 6: Final answer
    x = 963.84

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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.