Home / 21,880.91-30,195.64-12,931.63

Finding the Fourth Proportional to 21,880.91, 30,195.64 and 12,931.63

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Solution

The fourth proportional to 21,880.91, 30,195.64 and 12,931.63 is: 17,845.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,880.91 : 30,195.64 = 12,931.63 : x
  2. Step 2: Convert to fraction form
    21,880.91/30,195.64 = 12,931.63/x
  3. Step 3: Cross multiply
    21,880.91x = 30,195.64 × 12,931.63
  4. Step 4: Simplify right side
    21,880.91x = 390,478,844.09
  5. Step 5: Solve for x
    x = 390,478,844.09/21,880.91
  6. Step 6: Final answer
    x = 17,845.64

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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.