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Finding the Fourth Proportional to 905.61, 1,356.51 and 579.99

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Solution

The fourth proportional to 905.61, 1,356.51 and 579.99 is: 868.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.61 : 1,356.51 = 579.99 : x
  2. Step 2: Convert to fraction form
    905.61/1,356.51 = 579.99/x
  3. Step 3: Cross multiply
    905.61x = 1,356.51 × 579.99
  4. Step 4: Simplify right side
    905.61x = 786,762.23
  5. Step 5: Solve for x
    x = 786,762.23/905.61
  6. Step 6: Final answer
    x = 868.76

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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.