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Finding the Fourth Proportional to 12,798.40, 17,658.10 and 8,328.72

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Solution

The fourth proportional to 12,798.40, 17,658.10 and 8,328.72 is: 11,491.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,798.40 : 17,658.10 = 8,328.72 : x
  2. Step 2: Convert to fraction form
    12,798.40/17,658.10 = 8,328.72/x
  3. Step 3: Cross multiply
    12,798.40x = 17,658.10 × 8,328.72
  4. Step 4: Simplify right side
    12,798.40x = 147,069,370.63
  5. Step 5: Solve for x
    x = 147,069,370.63/12,798.40
  6. Step 6: Final answer
    x = 11,491.23

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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.