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Finding the Fourth Proportional to 729.50, 1,006.77 and 419.06

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Solution

The fourth proportional to 729.50, 1,006.77 and 419.06 is: 578.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.50 : 1,006.77 = 419.06 : x
  2. Step 2: Convert to fraction form
    729.50/1,006.77 = 419.06/x
  3. Step 3: Cross multiply
    729.50x = 1,006.77 × 419.06
  4. Step 4: Simplify right side
    729.50x = 421,897.04
  5. Step 5: Solve for x
    x = 421,897.04/729.50
  6. Step 6: Final answer
    x = 578.34

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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.