Home / 30,790.47-42,428.07-21,233.28

Finding the Fourth Proportional to 30,790.47, 42,428.07 and 21,233.28

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Solution

The fourth proportional to 30,790.47, 42,428.07 and 21,233.28 is: 29,258.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,790.47 : 42,428.07 = 21,233.28 : x
  2. Step 2: Convert to fraction form
    30,790.47/42,428.07 = 21,233.28/x
  3. Step 3: Cross multiply
    30,790.47x = 42,428.07 × 21,233.28
  4. Step 4: Simplify right side
    30,790.47x = 900,887,090.17
  5. Step 5: Solve for x
    x = 900,887,090.17/30,790.47
  6. Step 6: Final answer
    x = 29,258.63

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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.