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Finding the Fourth Proportional to 3,325.56, 4,988.60 and 860.40

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Solution

The fourth proportional to 3,325.56, 4,988.60 and 860.40 is: 1,290.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,325.56 : 4,988.60 = 860.40 : x
  2. Step 2: Convert to fraction form
    3,325.56/4,988.60 = 860.40/x
  3. Step 3: Cross multiply
    3,325.56x = 4,988.60 × 860.40
  4. Step 4: Simplify right side
    3,325.56x = 4,292,187.14
  5. Step 5: Solve for x
    x = 4,292,187.14/3,325.56
  6. Step 6: Final answer
    x = 1,290.67

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1.5x scale

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.