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Finding the Fourth Proportional to 758.21, 1,136.10 and 433.40

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Solution

The fourth proportional to 758.21, 1,136.10 and 433.40 is: 649.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.21 : 1,136.10 = 433.40 : x
  2. Step 2: Convert to fraction form
    758.21/1,136.10 = 433.40/x
  3. Step 3: Cross multiply
    758.21x = 1,136.10 × 433.40
  4. Step 4: Simplify right side
    758.21x = 492,385.74
  5. Step 5: Solve for x
    x = 492,385.74/758.21
  6. Step 6: Final answer
    x = 649.41

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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.