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Finding the Fourth Proportional to 1,136.10, 1,703.70 and 405.30

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Solution

The fourth proportional to 1,136.10, 1,703.70 and 405.30 is: 607.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.10 : 1,703.70 = 405.30 : x
  2. Step 2: Convert to fraction form
    1,136.10/1,703.70 = 405.30/x
  3. Step 3: Cross multiply
    1,136.10x = 1,703.70 × 405.30
  4. Step 4: Simplify right side
    1,136.10x = 690,509.61
  5. Step 5: Solve for x
    x = 690,509.61/1,136.10
  6. Step 6: Final answer
    x = 607.79

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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.