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Finding the Fourth Proportional to 656.85, 985.29 and 618.81

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Solution

The fourth proportional to 656.85, 985.29 and 618.81 is: 928.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.85 : 985.29 = 618.81 : x
  2. Step 2: Convert to fraction form
    656.85/985.29 = 618.81/x
  3. Step 3: Cross multiply
    656.85x = 985.29 × 618.81
  4. Step 4: Simplify right side
    656.85x = 609,707.30
  5. Step 5: Solve for x
    x = 609,707.30/656.85
  6. Step 6: Final answer
    x = 928.23

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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.