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Finding the Fourth Proportional to 18,666.40, 28,010.40 and 6,980.80

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Solution

The fourth proportional to 18,666.40, 28,010.40 and 6,980.80 is: 10,475.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,666.40 : 28,010.40 = 6,980.80 : x
  2. Step 2: Convert to fraction form
    18,666.40/28,010.40 = 6,980.80/x
  3. Step 3: Cross multiply
    18,666.40x = 28,010.40 × 6,980.80
  4. Step 4: Simplify right side
    18,666.40x = 195,535,000.32
  5. Step 5: Solve for x
    x = 195,535,000.32/18,666.40
  6. Step 6: Final answer
    x = 10,475.24

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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.