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Finding the Fourth Proportional to 1,270.34, 1,905.01 and 489.91

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Solution

The fourth proportional to 1,270.34, 1,905.01 and 489.91 is: 734.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.34 : 1,905.01 = 489.91 : x
  2. Step 2: Convert to fraction form
    1,270.34/1,905.01 = 489.91/x
  3. Step 3: Cross multiply
    1,270.34x = 1,905.01 × 489.91
  4. Step 4: Simplify right side
    1,270.34x = 933,284.61
  5. Step 5: Solve for x
    x = 933,284.61/1,270.34
  6. Step 6: Final answer
    x = 734.67

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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.