Home / 30,728.90-42,409.06-18,800.16

Finding the Fourth Proportional to 30,728.90, 42,409.06 and 18,800.16

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Solution

The fourth proportional to 30,728.90, 42,409.06 and 18,800.16 is: 25,946.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,728.90 : 42,409.06 = 18,800.16 : x
  2. Step 2: Convert to fraction form
    30,728.90/42,409.06 = 18,800.16/x
  3. Step 3: Cross multiply
    30,728.90x = 42,409.06 × 18,800.16
  4. Step 4: Simplify right side
    30,728.90x = 797,297,113.45
  5. Step 5: Solve for x
    x = 797,297,113.45/30,728.90
  6. Step 6: Final answer
    x = 25,946.17

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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.