Home / 21,005.62-28,987.76-11,574.40

Finding the Fourth Proportional to 21,005.62, 28,987.76 and 11,574.40

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Solution

The fourth proportional to 21,005.62, 28,987.76 and 11,574.40 is: 15,972.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.62 : 28,987.76 = 11,574.40 : x
  2. Step 2: Convert to fraction form
    21,005.62/28,987.76 = 11,574.40/x
  3. Step 3: Cross multiply
    21,005.62x = 28,987.76 × 11,574.40
  4. Step 4: Simplify right side
    21,005.62x = 335,515,929.34
  5. Step 5: Solve for x
    x = 335,515,929.34/21,005.62
  6. Step 6: Final answer
    x = 15,972.67

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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.