Home / 30,998.40-42,783.96-18,420.72

Finding the Fourth Proportional to 30,998.40, 42,783.96 and 18,420.72

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Solution

The fourth proportional to 30,998.40, 42,783.96 and 18,420.72 is: 25,424.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,998.40 : 42,783.96 = 18,420.72 : x
  2. Step 2: Convert to fraction form
    30,998.40/42,783.96 = 18,420.72/x
  3. Step 3: Cross multiply
    30,998.40x = 42,783.96 × 18,420.72
  4. Step 4: Simplify right side
    30,998.40x = 788,111,347.65
  5. Step 5: Solve for x
    x = 788,111,347.65/30,998.40
  6. Step 6: Final answer
    x = 25,424.26

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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.