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Finding the Fourth Proportional to 786.13, 1,084.40 and 454.50

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Solution

The fourth proportional to 786.13, 1,084.40 and 454.50 is: 626.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.13 : 1,084.40 = 454.50 : x
  2. Step 2: Convert to fraction form
    786.13/1,084.40 = 454.50/x
  3. Step 3: Cross multiply
    786.13x = 1,084.40 × 454.50
  4. Step 4: Simplify right side
    786.13x = 492,859.80
  5. Step 5: Solve for x
    x = 492,859.80/786.13
  6. Step 6: Final answer
    x = 626.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.