Home / 30,926.60-42,688.99-21,999.99

Finding the Fourth Proportional to 30,926.60, 42,688.99 and 21,999.99

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Solution

The fourth proportional to 30,926.60, 42,688.99 and 21,999.99 is: 30,367.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,926.60 : 42,688.99 = 21,999.99 : x
  2. Step 2: Convert to fraction form
    30,926.60/42,688.99 = 21,999.99/x
  3. Step 3: Cross multiply
    30,926.60x = 42,688.99 × 21,999.99
  4. Step 4: Simplify right side
    30,926.60x = 939,157,353.11
  5. Step 5: Solve for x
    x = 939,157,353.11/30,926.60
  6. Step 6: Final answer
    x = 30,367.30

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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.