Home / 30,972.84-42,728.76-18,390.28

Finding the Fourth Proportional to 30,972.84, 42,728.76 and 18,390.28

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Solution

The fourth proportional to 30,972.84, 42,728.76 and 18,390.28 is: 25,370.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,972.84 : 42,728.76 = 18,390.28 : x
  2. Step 2: Convert to fraction form
    30,972.84/42,728.76 = 18,390.28/x
  3. Step 3: Cross multiply
    30,972.84x = 42,728.76 × 18,390.28
  4. Step 4: Simplify right side
    30,972.84x = 785,793,860.45
  5. Step 5: Solve for x
    x = 785,793,860.45/30,972.84
  6. Step 6: Final answer
    x = 25,370.42

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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.