Home / 30,990.48-42,770.56-18,415.28

Finding the Fourth Proportional to 30,990.48, 42,770.56 and 18,415.28

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Solution

The fourth proportional to 30,990.48, 42,770.56 and 18,415.28 is: 25,415.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,990.48 : 42,770.56 = 18,415.28 : x
  2. Step 2: Convert to fraction form
    30,990.48/42,770.56 = 18,415.28/x
  3. Step 3: Cross multiply
    30,990.48x = 42,770.56 × 18,415.28
  4. Step 4: Simplify right side
    30,990.48x = 787,631,838.16
  5. Step 5: Solve for x
    x = 787,631,838.16/30,990.48
  6. Step 6: Final answer
    x = 25,415.28

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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.