Home / 21,208.12-31,812.50-7,357.40

Finding the Fourth Proportional to 21,208.12, 31,812.50 and 7,357.40

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Solution

The fourth proportional to 21,208.12, 31,812.50 and 7,357.40 is: 11,036.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,208.12 : 31,812.50 = 7,357.40 : x
  2. Step 2: Convert to fraction form
    21,208.12/31,812.50 = 7,357.40/x
  3. Step 3: Cross multiply
    21,208.12x = 31,812.50 × 7,357.40
  4. Step 4: Simplify right side
    21,208.12x = 234,057,287.50
  5. Step 5: Solve for x
    x = 234,057,287.50/21,208.12
  6. Step 6: Final answer
    x = 11,036.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.