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Finding the Fourth Proportional to 805.79, 1,112.34 and 609.35

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Solution

The fourth proportional to 805.79, 1,112.34 and 609.35 is: 841.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.79 : 1,112.34 = 609.35 : x
  2. Step 2: Convert to fraction form
    805.79/1,112.34 = 609.35/x
  3. Step 3: Cross multiply
    805.79x = 1,112.34 × 609.35
  4. Step 4: Simplify right side
    805.79x = 677,804.38
  5. Step 5: Solve for x
    x = 677,804.38/805.79
  6. Step 6: Final answer
    x = 841.17

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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.