Home / 30,678.11-42,343.31-18,751.45

Finding the Fourth Proportional to 30,678.11, 42,343.31 and 18,751.45

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Solution

The fourth proportional to 30,678.11, 42,343.31 and 18,751.45 is: 25,881.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,678.11 : 42,343.31 = 18,751.45 : x
  2. Step 2: Convert to fraction form
    30,678.11/42,343.31 = 18,751.45/x
  3. Step 3: Cross multiply
    30,678.11x = 42,343.31 × 18,751.45
  4. Step 4: Simplify right side
    30,678.11x = 793,998,401.32
  5. Step 5: Solve for x
    x = 793,998,401.32/30,678.11
  6. Step 6: Final answer
    x = 25,881.59

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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.