Home / 20,905.09-28,862.54-12,955.75

Finding the Fourth Proportional to 20,905.09, 28,862.54 and 12,955.75

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Solution

The fourth proportional to 20,905.09, 28,862.54 and 12,955.75 is: 17,887.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.09 : 28,862.54 = 12,955.75 : x
  2. Step 2: Convert to fraction form
    20,905.09/28,862.54 = 12,955.75/x
  3. Step 3: Cross multiply
    20,905.09x = 28,862.54 × 12,955.75
  4. Step 4: Simplify right side
    20,905.09x = 373,935,852.61
  5. Step 5: Solve for x
    x = 373,935,852.61/20,905.09
  6. Step 6: Final answer
    x = 17,887.31

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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.