Home / 21,852.36-30,156.18-12,420.90

Finding the Fourth Proportional to 21,852.36, 30,156.18 and 12,420.90

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Solution

The fourth proportional to 21,852.36, 30,156.18 and 12,420.90 is: 17,140.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,852.36 : 30,156.18 = 12,420.90 : x
  2. Step 2: Convert to fraction form
    21,852.36/30,156.18 = 12,420.90/x
  3. Step 3: Cross multiply
    21,852.36x = 30,156.18 × 12,420.90
  4. Step 4: Simplify right side
    21,852.36x = 374,566,896.16
  5. Step 5: Solve for x
    x = 374,566,896.16/21,852.36
  6. Step 6: Final answer
    x = 17,140.80

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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.