Home / 21,756.16-30,020.64-13,784.32

Finding the Fourth Proportional to 21,756.16, 30,020.64 and 13,784.32

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Solution

The fourth proportional to 21,756.16, 30,020.64 and 13,784.32 is: 19,020.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,756.16 : 30,020.64 = 13,784.32 : x
  2. Step 2: Convert to fraction form
    21,756.16/30,020.64 = 13,784.32/x
  3. Step 3: Cross multiply
    21,756.16x = 30,020.64 × 13,784.32
  4. Step 4: Simplify right side
    21,756.16x = 413,814,108.36
  5. Step 5: Solve for x
    x = 413,814,108.36/21,756.16
  6. Step 6: Final answer
    x = 19,020.55

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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.