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Finding the Fourth Proportional to 8,430.76, 12,640.74 and 3,503.80

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Solution

The fourth proportional to 8,430.76, 12,640.74 and 3,503.80 is: 5,253.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,430.76 : 12,640.74 = 3,503.80 : x
  2. Step 2: Convert to fraction form
    8,430.76/12,640.74 = 3,503.80/x
  3. Step 3: Cross multiply
    8,430.76x = 12,640.74 × 3,503.80
  4. Step 4: Simplify right side
    8,430.76x = 44,290,624.81
  5. Step 5: Solve for x
    x = 44,290,624.81/8,430.76
  6. Step 6: Final answer
    x = 5,253.46

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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.