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Finding the Fourth Proportional to 1,277.40, 1,915.46 and 411.60

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Solution

The fourth proportional to 1,277.40, 1,915.46 and 411.60 is: 617.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.40 : 1,915.46 = 411.60 : x
  2. Step 2: Convert to fraction form
    1,277.40/1,915.46 = 411.60/x
  3. Step 3: Cross multiply
    1,277.40x = 1,915.46 × 411.60
  4. Step 4: Simplify right side
    1,277.40x = 788,403.34
  5. Step 5: Solve for x
    x = 788,403.34/1,277.40
  6. Step 6: Final answer
    x = 617.19

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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.