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Finding the Fourth Proportional to 885.30, 1,221.65 and 492.29

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Solution

The fourth proportional to 885.30, 1,221.65 and 492.29 is: 679.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.30 : 1,221.65 = 492.29 : x
  2. Step 2: Convert to fraction form
    885.30/1,221.65 = 492.29/x
  3. Step 3: Cross multiply
    885.30x = 1,221.65 × 492.29
  4. Step 4: Simplify right side
    885.30x = 601,406.08
  5. Step 5: Solve for x
    x = 601,406.08/885.30
  6. Step 6: Final answer
    x = 679.32

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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.