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Finding the Fourth Proportional to 1,312.54, 1,968.74 and 490.75

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Solution

The fourth proportional to 1,312.54, 1,968.74 and 490.75 is: 736.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.54 : 1,968.74 = 490.75 : x
  2. Step 2: Convert to fraction form
    1,312.54/1,968.74 = 490.75/x
  3. Step 3: Cross multiply
    1,312.54x = 1,968.74 × 490.75
  4. Step 4: Simplify right side
    1,312.54x = 966,153.62
  5. Step 5: Solve for x
    x = 966,153.62/1,312.54
  6. Step 6: Final answer
    x = 736.10

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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.