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Finding the Fourth Proportional to 1,313.74, 1,970.95 and 389.29

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Solution

The fourth proportional to 1,313.74, 1,970.95 and 389.29 is: 584.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.74 : 1,970.95 = 389.29 : x
  2. Step 2: Convert to fraction form
    1,313.74/1,970.95 = 389.29/x
  3. Step 3: Cross multiply
    1,313.74x = 1,970.95 × 389.29
  4. Step 4: Simplify right side
    1,313.74x = 767,269.65
  5. Step 5: Solve for x
    x = 767,269.65/1,313.74
  6. Step 6: Final answer
    x = 584.04

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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.