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Finding the Fourth Proportional to 890.55, 1,228.92 and 492.20

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Solution

The fourth proportional to 890.55, 1,228.92 and 492.20 is: 679.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.55 : 1,228.92 = 492.20 : x
  2. Step 2: Convert to fraction form
    890.55/1,228.92 = 492.20/x
  3. Step 3: Cross multiply
    890.55x = 1,228.92 × 492.20
  4. Step 4: Simplify right side
    890.55x = 604,868.28
  5. Step 5: Solve for x
    x = 604,868.28/890.55
  6. Step 6: Final answer
    x = 679.21

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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.