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Finding the Fourth Proportional to 1,256.85, 1,886.01 and 640.53

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Solution

The fourth proportional to 1,256.85, 1,886.01 and 640.53 is: 961.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.85 : 1,886.01 = 640.53 : x
  2. Step 2: Convert to fraction form
    1,256.85/1,886.01 = 640.53/x
  3. Step 3: Cross multiply
    1,256.85x = 1,886.01 × 640.53
  4. Step 4: Simplify right side
    1,256.85x = 1,208,045.99
  5. Step 5: Solve for x
    x = 1,208,045.99/1,256.85
  6. Step 6: Final answer
    x = 961.17

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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.