Home / 39,870.24-55,021.28-21,965.28

Finding the Fourth Proportional to 39,870.24, 55,021.28 and 21,965.28

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Solution

The fourth proportional to 39,870.24, 55,021.28 and 21,965.28 is: 30,312.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,870.24 : 55,021.28 = 21,965.28 : x
  2. Step 2: Convert to fraction form
    39,870.24/55,021.28 = 21,965.28/x
  3. Step 3: Cross multiply
    39,870.24x = 55,021.28 × 21,965.28
  4. Step 4: Simplify right side
    39,870.24x = 1,208,557,821.16
  5. Step 5: Solve for x
    x = 1,208,557,821.16/39,870.24
  6. Step 6: Final answer
    x = 30,312.28

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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.