Home / 30,970.16-42,724.64-18,219.36

Finding the Fourth Proportional to 30,970.16, 42,724.64 and 18,219.36

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Solution

The fourth proportional to 30,970.16, 42,724.64 and 18,219.36 is: 25,134.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,970.16 : 42,724.64 = 18,219.36 : x
  2. Step 2: Convert to fraction form
    30,970.16/42,724.64 = 18,219.36/x
  3. Step 3: Cross multiply
    30,970.16x = 42,724.64 × 18,219.36
  4. Step 4: Simplify right side
    30,970.16x = 778,415,597.03
  5. Step 5: Solve for x
    x = 778,415,597.03/30,970.16
  6. Step 6: Final answer
    x = 25,134.37

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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.