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Finding the Fourth Proportional to 890.60, 1,228.98 and 558.92

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Solution

The fourth proportional to 890.60, 1,228.98 and 558.92 is: 771.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.60 : 1,228.98 = 558.92 : x
  2. Step 2: Convert to fraction form
    890.60/1,228.98 = 558.92/x
  3. Step 3: Cross multiply
    890.60x = 1,228.98 × 558.92
  4. Step 4: Simplify right side
    890.60x = 686,901.50
  5. Step 5: Solve for x
    x = 686,901.50/890.60
  6. Step 6: Final answer
    x = 771.28

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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.