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Finding the Fourth Proportional to 13,698.30, 18,903.20 and 7,731.30

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Solution

The fourth proportional to 13,698.30, 18,903.20 and 7,731.30 is: 10,668.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,698.30 : 18,903.20 = 7,731.30 : x
  2. Step 2: Convert to fraction form
    13,698.30/18,903.20 = 7,731.30/x
  3. Step 3: Cross multiply
    13,698.30x = 18,903.20 × 7,731.30
  4. Step 4: Simplify right side
    13,698.30x = 146,146,271.50
  5. Step 5: Solve for x
    x = 146,146,271.50/13,698.30
  6. Step 6: Final answer
    x = 10,668.93

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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.