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Finding the Fourth Proportional to 839.50, 1,158.66 and 570.21

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Solution

The fourth proportional to 839.50, 1,158.66 and 570.21 is: 786.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.50 : 1,158.66 = 570.21 : x
  2. Step 2: Convert to fraction form
    839.50/1,158.66 = 570.21/x
  3. Step 3: Cross multiply
    839.50x = 1,158.66 × 570.21
  4. Step 4: Simplify right side
    839.50x = 660,673.73
  5. Step 5: Solve for x
    x = 660,673.73/839.50
  6. Step 6: Final answer
    x = 786.98

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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.