Home / 30,438.99-42,007.41-18,500.40

Finding the Fourth Proportional to 30,438.99, 42,007.41 and 18,500.40

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Solution

The fourth proportional to 30,438.99, 42,007.41 and 18,500.40 is: 25,531.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,438.99 : 42,007.41 = 18,500.40 : x
  2. Step 2: Convert to fraction form
    30,438.99/42,007.41 = 18,500.40/x
  3. Step 3: Cross multiply
    30,438.99x = 42,007.41 × 18,500.40
  4. Step 4: Simplify right side
    30,438.99x = 777,153,887.96
  5. Step 5: Solve for x
    x = 777,153,887.96/30,438.99
  6. Step 6: Final answer
    x = 25,531.53

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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.