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Finding the Fourth Proportional to 3,720.60, 5,580.90 and 947.29

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Solution

The fourth proportional to 3,720.60, 5,580.90 and 947.29 is: 1,420.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,720.60 : 5,580.90 = 947.29 : x
  2. Step 2: Convert to fraction form
    3,720.60/5,580.90 = 947.29/x
  3. Step 3: Cross multiply
    3,720.60x = 5,580.90 × 947.29
  4. Step 4: Simplify right side
    3,720.60x = 5,286,730.76
  5. Step 5: Solve for x
    x = 5,286,730.76/3,720.60
  6. Step 6: Final answer
    x = 1,420.94

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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.