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Finding the Fourth Proportional to 1,943.46, 2,915.76 and 645.84

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Solution

The fourth proportional to 1,943.46, 2,915.76 and 645.84 is: 968.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,943.46 : 2,915.76 = 645.84 : x
  2. Step 2: Convert to fraction form
    1,943.46/2,915.76 = 645.84/x
  3. Step 3: Cross multiply
    1,943.46x = 2,915.76 × 645.84
  4. Step 4: Simplify right side
    1,943.46x = 1,883,114.44
  5. Step 5: Solve for x
    x = 1,883,114.44/1,943.46
  6. Step 6: Final answer
    x = 968.95

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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.