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Finding the Fourth Proportional to 7,182.80, 9,911.70 and 4,038.40

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Solution

The fourth proportional to 7,182.80, 9,911.70 and 4,038.40 is: 5,572.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,182.80 : 9,911.70 = 4,038.40 : x
  2. Step 2: Convert to fraction form
    7,182.80/9,911.70 = 4,038.40/x
  3. Step 3: Cross multiply
    7,182.80x = 9,911.70 × 4,038.40
  4. Step 4: Simplify right side
    7,182.80x = 40,027,409.28
  5. Step 5: Solve for x
    x = 40,027,409.28/7,182.80
  6. Step 6: Final answer
    x = 5,572.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.