Home / 15,315.64-21,120.04-14,422.72

Finding the Fourth Proportional to 15,315.64, 21,120.04 and 14,422.72

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Solution

The fourth proportional to 15,315.64, 21,120.04 and 14,422.72 is: 19,888.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,315.64 : 21,120.04 = 14,422.72 : x
  2. Step 2: Convert to fraction form
    15,315.64/21,120.04 = 14,422.72/x
  3. Step 3: Cross multiply
    15,315.64x = 21,120.04 × 14,422.72
  4. Step 4: Simplify right side
    15,315.64x = 304,608,423.31
  5. Step 5: Solve for x
    x = 304,608,423.31/15,315.64
  6. Step 6: Final answer
    x = 19,888.72

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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.