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Finding the Fourth Proportional to 805.55, 1,111.50 and 456.23

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Solution

The fourth proportional to 805.55, 1,111.50 and 456.23 is: 629.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.55 : 1,111.50 = 456.23 : x
  2. Step 2: Convert to fraction form
    805.55/1,111.50 = 456.23/x
  3. Step 3: Cross multiply
    805.55x = 1,111.50 × 456.23
  4. Step 4: Simplify right side
    805.55x = 507,094.09
  5. Step 5: Solve for x
    x = 507,094.09/805.55
  6. Step 6: Final answer
    x = 629.50

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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.