Home / 30,918.84-42,660.81-20,865.93

Finding the Fourth Proportional to 30,918.84, 42,660.81 and 20,865.93

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Solution

The fourth proportional to 30,918.84, 42,660.81 and 20,865.93 is: 28,790.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,918.84 : 42,660.81 = 20,865.93 : x
  2. Step 2: Convert to fraction form
    30,918.84/42,660.81 = 20,865.93/x
  3. Step 3: Cross multiply
    30,918.84x = 42,660.81 × 20,865.93
  4. Step 4: Simplify right side
    30,918.84x = 890,157,475.20
  5. Step 5: Solve for x
    x = 890,157,475.20/30,918.84
  6. Step 6: Final answer
    x = 28,790.13

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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.