Home / 39,875.40-55,028.75-21,970.28

Finding the Fourth Proportional to 39,875.40, 55,028.75 and 21,970.28

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Solution

The fourth proportional to 39,875.40, 55,028.75 and 21,970.28 is: 30,319.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,875.40 : 55,028.75 = 21,970.28 : x
  2. Step 2: Convert to fraction form
    39,875.40/55,028.75 = 21,970.28/x
  3. Step 3: Cross multiply
    39,875.40x = 55,028.75 × 21,970.28
  4. Step 4: Simplify right side
    39,875.40x = 1,208,996,660.55
  5. Step 5: Solve for x
    x = 1,208,996,660.55/39,875.40
  6. Step 6: Final answer
    x = 30,319.36

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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.