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Finding the Fourth Proportional to 1,314, 1,970.86 and 389.56

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Solution

The fourth proportional to 1,314, 1,970.86 and 389.56 is: 584.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314 : 1,970.86 = 389.56 : x
  2. Step 2: Convert to fraction form
    1,314/1,970.86 = 389.56/x
  3. Step 3: Cross multiply
    1,314x = 1,970.86 × 389.56
  4. Step 4: Simplify right side
    1,314x = 767,768.22
  5. Step 5: Solve for x
    x = 767,768.22/1,314
  6. Step 6: Final answer
    x = 584.30

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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.