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Finding the Fourth Proportional to 1,942.07, 2,913.51 and 643.55

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Solution

The fourth proportional to 1,942.07, 2,913.51 and 643.55 is: 965.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,942.07 : 2,913.51 = 643.55 : x
  2. Step 2: Convert to fraction form
    1,942.07/2,913.51 = 643.55/x
  3. Step 3: Cross multiply
    1,942.07x = 2,913.51 × 643.55
  4. Step 4: Simplify right side
    1,942.07x = 1,874,989.36
  5. Step 5: Solve for x
    x = 1,874,989.36/1,942.07
  6. Step 6: Final answer
    x = 965.46

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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.