Home / 21,307.89-31,971.05-11,435.63

Finding the Fourth Proportional to 21,307.89, 31,971.05 and 11,435.63

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Solution

The fourth proportional to 21,307.89, 31,971.05 and 11,435.63 is: 17,158.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,307.89 : 31,971.05 = 11,435.63 : x
  2. Step 2: Convert to fraction form
    21,307.89/31,971.05 = 11,435.63/x
  3. Step 3: Cross multiply
    21,307.89x = 31,971.05 × 11,435.63
  4. Step 4: Simplify right side
    21,307.89x = 365,609,072.04
  5. Step 5: Solve for x
    x = 365,609,072.04/21,307.89
  6. Step 6: Final answer
    x = 17,158.39

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1.5x scale

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.