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Finding the Fourth Proportional to 30,390.48, 41,905.80 and 19,760.40

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Solution

The fourth proportional to 30,390.48, 41,905.80 and 19,760.40 is: 27,247.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,390.48 : 41,905.80 = 19,760.40 : x
  2. Step 2: Convert to fraction form
    30,390.48/41,905.80 = 19,760.40/x
  3. Step 3: Cross multiply
    30,390.48x = 41,905.80 × 19,760.40
  4. Step 4: Simplify right side
    30,390.48x = 828,075,370.32
  5. Step 5: Solve for x
    x = 828,075,370.32/30,390.48
  6. Step 6: Final answer
    x = 27,247.85

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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.