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Finding the Fourth Proportional to 81,133.95, 121,686.88 and 21,955.80

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Solution

The fourth proportional to 81,133.95, 121,686.88 and 21,955.80 is: 32,929.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,133.95 : 121,686.88 = 21,955.80 : x
  2. Step 2: Convert to fraction form
    81,133.95/121,686.88 = 21,955.80/x
  3. Step 3: Cross multiply
    81,133.95x = 121,686.88 × 21,955.80
  4. Step 4: Simplify right side
    81,133.95x = 2,671,732,136.58
  5. Step 5: Solve for x
    x = 2,671,732,136.58/81,133.95
  6. Step 6: Final answer
    x = 32,929.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.