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Finding the Fourth Proportional to 623.55, 865.16 and 618.26

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Solution

The fourth proportional to 623.55, 865.16 and 618.26 is: 857.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.55 : 865.16 = 618.26 : x
  2. Step 2: Convert to fraction form
    623.55/865.16 = 618.26/x
  3. Step 3: Cross multiply
    623.55x = 865.16 × 618.26
  4. Step 4: Simplify right side
    623.55x = 534,886.40
  5. Step 5: Solve for x
    x = 534,886.40/623.55
  6. Step 6: Final answer
    x = 857.81

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.