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Finding the Fourth Proportional to 1,307.89, 1,956.97 and 788.28

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Solution

The fourth proportional to 1,307.89, 1,956.97 and 788.28 is: 1,179.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.89 : 1,956.97 = 788.28 : x
  2. Step 2: Convert to fraction form
    1,307.89/1,956.97 = 788.28/x
  3. Step 3: Cross multiply
    1,307.89x = 1,956.97 × 788.28
  4. Step 4: Simplify right side
    1,307.89x = 1,542,640.31
  5. Step 5: Solve for x
    x = 1,542,640.31/1,307.89
  6. Step 6: Final answer
    x = 1,179.49

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1.5x scale

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.