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Finding the Fourth Proportional to 805.30, 1,111.39 and 456.10

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Solution

The fourth proportional to 805.30, 1,111.39 and 456.10 is: 629.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.30 : 1,111.39 = 456.10 : x
  2. Step 2: Convert to fraction form
    805.30/1,111.39 = 456.10/x
  3. Step 3: Cross multiply
    805.30x = 1,111.39 × 456.10
  4. Step 4: Simplify right side
    805.30x = 506,904.98
  5. Step 5: Solve for x
    x = 506,904.98/805.30
  6. Step 6: Final answer
    x = 629.46

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1.5x scale

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.