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Finding the Fourth Proportional to 729.49, 1,006.79 and 434.75

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Solution

The fourth proportional to 729.49, 1,006.79 and 434.75 is: 600.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.49 : 1,006.79 = 434.75 : x
  2. Step 2: Convert to fraction form
    729.49/1,006.79 = 434.75/x
  3. Step 3: Cross multiply
    729.49x = 1,006.79 × 434.75
  4. Step 4: Simplify right side
    729.49x = 437,699.78
  5. Step 5: Solve for x
    x = 437,699.78/729.49
  6. Step 6: Final answer
    x = 600.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.