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Finding the Fourth Proportional to 699.40, 1,048.20 and 618.40

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Solution

The fourth proportional to 699.40, 1,048.20 and 618.40 is: 926.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.40 : 1,048.20 = 618.40 : x
  2. Step 2: Convert to fraction form
    699.40/1,048.20 = 618.40/x
  3. Step 3: Cross multiply
    699.40x = 1,048.20 × 618.40
  4. Step 4: Simplify right side
    699.40x = 648,206.88
  5. Step 5: Solve for x
    x = 648,206.88/699.40
  6. Step 6: Final answer
    x = 926.80

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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.