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Finding the Fourth Proportional to 860.04, 1,289.38 and 427.50

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Solution

The fourth proportional to 860.04, 1,289.38 and 427.50 is: 640.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.04 : 1,289.38 = 427.50 : x
  2. Step 2: Convert to fraction form
    860.04/1,289.38 = 427.50/x
  3. Step 3: Cross multiply
    860.04x = 1,289.38 × 427.50
  4. Step 4: Simplify right side
    860.04x = 551,209.95
  5. Step 5: Solve for x
    x = 551,209.95/860.04
  6. Step 6: Final answer
    x = 640.91

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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.