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Finding the Fourth Proportional to 18,918.75, 28,360.49 and 6,430.24

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Solution

The fourth proportional to 18,918.75, 28,360.49 and 6,430.24 is: 9,639.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.75 : 28,360.49 = 6,430.24 : x
  2. Step 2: Convert to fraction form
    18,918.75/28,360.49 = 6,430.24/x
  3. Step 3: Cross multiply
    18,918.75x = 28,360.49 × 6,430.24
  4. Step 4: Simplify right side
    18,918.75x = 182,364,654.17
  5. Step 5: Solve for x
    x = 182,364,654.17/18,918.75
  6. Step 6: Final answer
    x = 9,639.36

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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.