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Finding the Fourth Proportional to 10,280.80, 15,421.20 and 3,709

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Solution

The fourth proportional to 10,280.80, 15,421.20 and 3,709 is: 5,563.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,280.80 : 15,421.20 = 3,709 : x
  2. Step 2: Convert to fraction form
    10,280.80/15,421.20 = 3,709/x
  3. Step 3: Cross multiply
    10,280.80x = 15,421.20 × 3,709
  4. Step 4: Simplify right side
    10,280.80x = 57,197,230.80
  5. Step 5: Solve for x
    x = 57,197,230.80/10,280.80
  6. Step 6: Final answer
    x = 5,563.50

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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.