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Finding the Fourth Proportional to 890.60, 1,229.45 and 690.98

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Solution

The fourth proportional to 890.60, 1,229.45 and 690.98 is: 953.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.60 : 1,229.45 = 690.98 : x
  2. Step 2: Convert to fraction form
    890.60/1,229.45 = 690.98/x
  3. Step 3: Cross multiply
    890.60x = 1,229.45 × 690.98
  4. Step 4: Simplify right side
    890.60x = 849,515.76
  5. Step 5: Solve for x
    x = 849,515.76/890.60
  6. Step 6: Final answer
    x = 953.87

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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.