Home / 30,683.76-42,317.36-21,138.88

Finding the Fourth Proportional to 30,683.76, 42,317.36 and 21,138.88

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Solution

The fourth proportional to 30,683.76, 42,317.36 and 21,138.88 is: 29,153.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,683.76 : 42,317.36 = 21,138.88 : x
  2. Step 2: Convert to fraction form
    30,683.76/42,317.36 = 21,138.88/x
  3. Step 3: Cross multiply
    30,683.76x = 42,317.36 × 21,138.88
  4. Step 4: Simplify right side
    30,683.76x = 894,541,594.96
  5. Step 5: Solve for x
    x = 894,541,594.96/30,683.76
  6. Step 6: Final answer
    x = 29,153.58

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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.