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Finding the Fourth Proportional to 890.55, 1,228.95 and 492.24

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Solution

The fourth proportional to 890.55, 1,228.95 and 492.24 is: 679.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.55 : 1,228.95 = 492.24 : x
  2. Step 2: Convert to fraction form
    890.55/1,228.95 = 492.24/x
  3. Step 3: Cross multiply
    890.55x = 1,228.95 × 492.24
  4. Step 4: Simplify right side
    890.55x = 604,932.50
  5. Step 5: Solve for x
    x = 604,932.50/890.55
  6. Step 6: Final answer
    x = 679.28

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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.