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Finding the Fourth Proportional to 1,943.19, 2,915.19 and 644.64

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Solution

The fourth proportional to 1,943.19, 2,915.19 and 644.64 is: 967.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,943.19 : 2,915.19 = 644.64 : x
  2. Step 2: Convert to fraction form
    1,943.19/2,915.19 = 644.64/x
  3. Step 3: Cross multiply
    1,943.19x = 2,915.19 × 644.64
  4. Step 4: Simplify right side
    1,943.19x = 1,879,248.08
  5. Step 5: Solve for x
    x = 1,879,248.08/1,943.19
  6. Step 6: Final answer
    x = 967.09

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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.