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Finding the Fourth Proportional to 12,798.40, 17,658.72 and 7,209.40

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Solution

The fourth proportional to 12,798.40, 17,658.72 and 7,209.40 is: 9,947.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,798.40 : 17,658.72 = 7,209.40 : x
  2. Step 2: Convert to fraction form
    12,798.40/17,658.72 = 7,209.40/x
  3. Step 3: Cross multiply
    12,798.40x = 17,658.72 × 7,209.40
  4. Step 4: Simplify right side
    12,798.40x = 127,308,775.97
  5. Step 5: Solve for x
    x = 127,308,775.97/12,798.40
  6. Step 6: Final answer
    x = 9,947.24

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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.