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Finding the Fourth Proportional to 12,653.70, 18,980.55 and 5,728.20

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Solution

The fourth proportional to 12,653.70, 18,980.55 and 5,728.20 is: 8,592.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,653.70 : 18,980.55 = 5,728.20 : x
  2. Step 2: Convert to fraction form
    12,653.70/18,980.55 = 5,728.20/x
  3. Step 3: Cross multiply
    12,653.70x = 18,980.55 × 5,728.20
  4. Step 4: Simplify right side
    12,653.70x = 108,724,386.51
  5. Step 5: Solve for x
    x = 108,724,386.51/12,653.70
  6. Step 6: Final answer
    x = 8,592.30

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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.