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Finding the Fourth Proportional to 1,942.16, 2,913.20 and 643.64

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Solution

The fourth proportional to 1,942.16, 2,913.20 and 643.64 is: 965.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,942.16 : 2,913.20 = 643.64 : x
  2. Step 2: Convert to fraction form
    1,942.16/2,913.20 = 643.64/x
  3. Step 3: Cross multiply
    1,942.16x = 2,913.20 × 643.64
  4. Step 4: Simplify right side
    1,942.16x = 1,875,052.05
  5. Step 5: Solve for x
    x = 1,875,052.05/1,942.16
  6. Step 6: Final answer
    x = 965.45

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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.