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Finding the Fourth Proportional to 1,313.17, 1,968.99 and 653.70

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Solution

The fourth proportional to 1,313.17, 1,968.99 and 653.70 is: 980.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.17 : 1,968.99 = 653.70 : x
  2. Step 2: Convert to fraction form
    1,313.17/1,968.99 = 653.70/x
  3. Step 3: Cross multiply
    1,313.17x = 1,968.99 × 653.70
  4. Step 4: Simplify right side
    1,313.17x = 1,287,137.37
  5. Step 5: Solve for x
    x = 1,287,137.37/1,313.17
  6. Step 6: Final answer
    x = 980.18

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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.