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Finding the Fourth Proportional to 1,810.46, 2,715.90 and 640.22

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Solution

The fourth proportional to 1,810.46, 2,715.90 and 640.22 is: 960.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,810.46 : 2,715.90 = 640.22 : x
  2. Step 2: Convert to fraction form
    1,810.46/2,715.90 = 640.22/x
  3. Step 3: Cross multiply
    1,810.46x = 2,715.90 × 640.22
  4. Step 4: Simplify right side
    1,810.46x = 1,738,762.32
  5. Step 5: Solve for x
    x = 1,738,762.32/1,810.46
  6. Step 6: Final answer
    x = 960.40

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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.