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Finding the Fourth Proportional to 859.60, 1,289.40 and 618.40

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Solution

The fourth proportional to 859.60, 1,289.40 and 618.40 is: 927.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.60 : 1,289.40 = 618.40 : x
  2. Step 2: Convert to fraction form
    859.60/1,289.40 = 618.40/x
  3. Step 3: Cross multiply
    859.60x = 1,289.40 × 618.40
  4. Step 4: Simplify right side
    859.60x = 797,364.96
  5. Step 5: Solve for x
    x = 797,364.96/859.60
  6. Step 6: Final answer
    x = 927.60

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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.