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Finding the Fourth Proportional to 619.30, 855.06 and 618.10

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Solution

The fourth proportional to 619.30, 855.06 and 618.10 is: 853.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.30 : 855.06 = 618.10 : x
  2. Step 2: Convert to fraction form
    619.30/855.06 = 618.10/x
  3. Step 3: Cross multiply
    619.30x = 855.06 × 618.10
  4. Step 4: Simplify right side
    619.30x = 528,512.59
  5. Step 5: Solve for x
    x = 528,512.59/619.30
  6. Step 6: Final answer
    x = 853.40

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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.