Home / 18,905.40-28,359.48-6,420.36

Finding the Fourth Proportional to 18,905.40, 28,359.48 and 6,420.36

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Solution

The fourth proportional to 18,905.40, 28,359.48 and 6,420.36 is: 9,631.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.40 : 28,359.48 = 6,420.36 : x
  2. Step 2: Convert to fraction form
    18,905.40/28,359.48 = 6,420.36/x
  3. Step 3: Cross multiply
    18,905.40x = 28,359.48 × 6,420.36
  4. Step 4: Simplify right side
    18,905.40x = 182,078,071.01
  5. Step 5: Solve for x
    x = 182,078,071.01/18,905.40
  6. Step 6: Final answer
    x = 9,631.01

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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.