Home / 30,660.71-42,343.90-21,125.39

Finding the Fourth Proportional to 30,660.71, 42,343.90 and 21,125.39

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Solution

The fourth proportional to 30,660.71, 42,343.90 and 21,125.39 is: 29,175.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,660.71 : 42,343.90 = 21,125.39 : x
  2. Step 2: Convert to fraction form
    30,660.71/42,343.90 = 21,125.39/x
  3. Step 3: Cross multiply
    30,660.71x = 42,343.90 × 21,125.39
  4. Step 4: Simplify right side
    30,660.71x = 894,531,189.90
  5. Step 5: Solve for x
    x = 894,531,189.90/30,660.71
  6. Step 6: Final answer
    x = 29,175.17

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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.