Home / 30,964.98-42,749.38-20,385.36

Finding the Fourth Proportional to 30,964.98, 42,749.38 and 20,385.36

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Solution

The fourth proportional to 30,964.98, 42,749.38 and 20,385.36 is: 28,143.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,964.98 : 42,749.38 = 20,385.36 : x
  2. Step 2: Convert to fraction form
    30,964.98/42,749.38 = 20,385.36/x
  3. Step 3: Cross multiply
    30,964.98x = 42,749.38 × 20,385.36
  4. Step 4: Simplify right side
    30,964.98x = 871,461,501.08
  5. Step 5: Solve for x
    x = 871,461,501.08/30,964.98
  6. Step 6: Final answer
    x = 28,143.45

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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.