Home / 30,420.48-41,947.20-19,790.40

Finding the Fourth Proportional to 30,420.48, 41,947.20 and 19,790.40

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Solution

The fourth proportional to 30,420.48, 41,947.20 and 19,790.40 is: 27,289.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,420.48 : 41,947.20 = 19,790.40 : x
  2. Step 2: Convert to fraction form
    30,420.48/41,947.20 = 19,790.40/x
  3. Step 3: Cross multiply
    30,420.48x = 41,947.20 × 19,790.40
  4. Step 4: Simplify right side
    30,420.48x = 830,151,866.88
  5. Step 5: Solve for x
    x = 830,151,866.88/30,420.48
  6. Step 6: Final answer
    x = 27,289.24

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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.