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Finding the Fourth Proportional to 890.60, 1,330.21 and 761

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Solution

The fourth proportional to 890.60, 1,330.21 and 761 is: 1,136.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.60 : 1,330.21 = 761 : x
  2. Step 2: Convert to fraction form
    890.60/1,330.21 = 761/x
  3. Step 3: Cross multiply
    890.60x = 1,330.21 × 761
  4. Step 4: Simplify right side
    890.60x = 1,012,289.81
  5. Step 5: Solve for x
    x = 1,012,289.81/890.60
  6. Step 6: Final answer
    x = 1,136.64

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.