Home / 12,420.39-17,130.94-9,012.54

Finding the Fourth Proportional to 12,420.39, 17,130.94 and 9,012.54

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Solution

The fourth proportional to 12,420.39, 17,130.94 and 9,012.54 is: 12,430.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,420.39 : 17,130.94 = 9,012.54 : x
  2. Step 2: Convert to fraction form
    12,420.39/17,130.94 = 9,012.54/x
  3. Step 3: Cross multiply
    12,420.39x = 17,130.94 × 9,012.54
  4. Step 4: Simplify right side
    12,420.39x = 154,393,281.99
  5. Step 5: Solve for x
    x = 154,393,281.99/12,420.39
  6. Step 6: Final answer
    x = 12,430.63

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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.