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Finding the Fourth Proportional to 8,280.40, 12,421.20 and 4,986.40

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Solution

The fourth proportional to 8,280.40, 12,421.20 and 4,986.40 is: 7,479.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,280.40 : 12,421.20 = 4,986.40 : x
  2. Step 2: Convert to fraction form
    8,280.40/12,421.20 = 4,986.40/x
  3. Step 3: Cross multiply
    8,280.40x = 12,421.20 × 4,986.40
  4. Step 4: Simplify right side
    8,280.40x = 61,937,071.68
  5. Step 5: Solve for x
    x = 61,937,071.68/8,280.40
  6. Step 6: Final answer
    x = 7,479.96

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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.