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Finding the Fourth Proportional to 30,579.90, 42,194.34 and 18,477.90

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Solution

The fourth proportional to 30,579.90, 42,194.34 and 18,477.90 is: 25,495.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,579.90 : 42,194.34 = 18,477.90 : x
  2. Step 2: Convert to fraction form
    30,579.90/42,194.34 = 18,477.90/x
  3. Step 3: Cross multiply
    30,579.90x = 42,194.34 × 18,477.90
  4. Step 4: Simplify right side
    30,579.90x = 779,662,795.09
  5. Step 5: Solve for x
    x = 779,662,795.09/30,579.90
  6. Step 6: Final answer
    x = 25,495.92

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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.