Home / 21,261.72-31,898.28-18,937.64

Finding the Fourth Proportional to 21,261.72, 31,898.28 and 18,937.64

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Solution

The fourth proportional to 21,261.72, 31,898.28 and 18,937.64 is: 28,411.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,261.72 : 31,898.28 = 18,937.64 : x
  2. Step 2: Convert to fraction form
    21,261.72/31,898.28 = 18,937.64/x
  3. Step 3: Cross multiply
    21,261.72x = 31,898.28 × 18,937.64
  4. Step 4: Simplify right side
    21,261.72x = 604,078,143.26
  5. Step 5: Solve for x
    x = 604,078,143.26/21,261.72
  6. Step 6: Final answer
    x = 28,411.54

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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.