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Finding the Fourth Proportional to 1,876.96, 2,812.37 and 643.71

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Solution

The fourth proportional to 1,876.96, 2,812.37 and 643.71 is: 964.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,876.96 : 2,812.37 = 643.71 : x
  2. Step 2: Convert to fraction form
    1,876.96/2,812.37 = 643.71/x
  3. Step 3: Cross multiply
    1,876.96x = 2,812.37 × 643.71
  4. Step 4: Simplify right side
    1,876.96x = 1,810,333.41
  5. Step 5: Solve for x
    x = 1,810,333.41/1,876.96
  6. Step 6: Final answer
    x = 964.50

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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.