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Finding the Fourth Proportional to 1,312.54, 1,968.60 and 728.14

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Solution

The fourth proportional to 1,312.54, 1,968.60 and 728.14 is: 1,092.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.54 : 1,968.60 = 728.14 : x
  2. Step 2: Convert to fraction form
    1,312.54/1,968.60 = 728.14/x
  3. Step 3: Cross multiply
    1,312.54x = 1,968.60 × 728.14
  4. Step 4: Simplify right side
    1,312.54x = 1,433,416.40
  5. Step 5: Solve for x
    x = 1,433,416.40/1,312.54
  6. Step 6: Final answer
    x = 1,092.09

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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.