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Finding the Fourth Proportional to 1,943.76, 2,915 and 644.88

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Solution

The fourth proportional to 1,943.76, 2,915 and 644.88 is: 967.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,943.76 : 2,915 = 644.88 : x
  2. Step 2: Convert to fraction form
    1,943.76/2,915 = 644.88/x
  3. Step 3: Cross multiply
    1,943.76x = 2,915 × 644.88
  4. Step 4: Simplify right side
    1,943.76x = 1,879,825.20
  5. Step 5: Solve for x
    x = 1,879,825.20/1,943.76
  6. Step 6: Final answer
    x = 967.11

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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.