Home / 21,285.24-31,931.10-7,431

Finding the Fourth Proportional to 21,285.24, 31,931.10 and 7,431

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Solution

The fourth proportional to 21,285.24, 31,931.10 and 7,431 is: 11,147.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,285.24 : 31,931.10 = 7,431 : x
  2. Step 2: Convert to fraction form
    21,285.24/31,931.10 = 7,431/x
  3. Step 3: Cross multiply
    21,285.24x = 31,931.10 × 7,431
  4. Step 4: Simplify right side
    21,285.24x = 237,280,004.10
  5. Step 5: Solve for x
    x = 237,280,004.10/21,285.24
  6. Step 6: Final answer
    x = 11,147.63

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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.