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Finding the Fourth Proportional to 8,328.40, 12,478.20 and 5,405.20

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Solution

The fourth proportional to 8,328.40, 12,478.20 and 5,405.20 is: 8,098.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,328.40 : 12,478.20 = 5,405.20 : x
  2. Step 2: Convert to fraction form
    8,328.40/12,478.20 = 5,405.20/x
  3. Step 3: Cross multiply
    8,328.40x = 12,478.20 × 5,405.20
  4. Step 4: Simplify right side
    8,328.40x = 67,447,166.64
  5. Step 5: Solve for x
    x = 67,447,166.64/8,328.40
  6. Step 6: Final answer
    x = 8,098.45

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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.