Home / 21,247.34-31,870.80-12,929.72

Finding the Fourth Proportional to 21,247.34, 31,870.80 and 12,929.72

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Solution

The fourth proportional to 21,247.34, 31,870.80 and 12,929.72 is: 19,394.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,247.34 : 31,870.80 = 12,929.72 : x
  2. Step 2: Convert to fraction form
    21,247.34/31,870.80 = 12,929.72/x
  3. Step 3: Cross multiply
    21,247.34x = 31,870.80 × 12,929.72
  4. Step 4: Simplify right side
    21,247.34x = 412,080,360.82
  5. Step 5: Solve for x
    x = 412,080,360.82/21,247.34
  6. Step 6: Final answer
    x = 19,394.45

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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.