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Finding the Fourth Proportional to 1,255.71, 1,883.70 and 434.05

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Solution

The fourth proportional to 1,255.71, 1,883.70 and 434.05 is: 651.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.71 : 1,883.70 = 434.05 : x
  2. Step 2: Convert to fraction form
    1,255.71/1,883.70 = 434.05/x
  3. Step 3: Cross multiply
    1,255.71x = 1,883.70 × 434.05
  4. Step 4: Simplify right side
    1,255.71x = 817,619.99
  5. Step 5: Solve for x
    x = 817,619.99/1,255.71
  6. Step 6: Final answer
    x = 651.12

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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.