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Finding the Fourth Proportional to 1,943.31, 2,915.42 and 644.78

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Solution

The fourth proportional to 1,943.31, 2,915.42 and 644.78 is: 967.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,943.31 : 2,915.42 = 644.78 : x
  2. Step 2: Convert to fraction form
    1,943.31/2,915.42 = 644.78/x
  3. Step 3: Cross multiply
    1,943.31x = 2,915.42 × 644.78
  4. Step 4: Simplify right side
    1,943.31x = 1,879,804.51
  5. Step 5: Solve for x
    x = 1,879,804.51/1,943.31
  6. Step 6: Final answer
    x = 967.32

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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.