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Finding the Fourth Proportional to 841.07, 1,261.79 and 285.74

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Solution

The fourth proportional to 841.07, 1,261.79 and 285.74 is: 428.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.07 : 1,261.79 = 285.74 : x
  2. Step 2: Convert to fraction form
    841.07/1,261.79 = 285.74/x
  3. Step 3: Cross multiply
    841.07x = 1,261.79 × 285.74
  4. Step 4: Simplify right side
    841.07x = 360,543.87
  5. Step 5: Solve for x
    x = 360,543.87/841.07
  6. Step 6: Final answer
    x = 428.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.