Home / 21,051.47-31,497.01-18,718.67

Finding the Fourth Proportional to 21,051.47, 31,497.01 and 18,718.67

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Solution

The fourth proportional to 21,051.47, 31,497.01 and 18,718.67 is: 28,006.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,051.47 : 31,497.01 = 18,718.67 : x
  2. Step 2: Convert to fraction form
    21,051.47/31,497.01 = 18,718.67/x
  3. Step 3: Cross multiply
    21,051.47x = 31,497.01 × 18,718.67
  4. Step 4: Simplify right side
    21,051.47x = 589,582,136.18
  5. Step 5: Solve for x
    x = 589,582,136.18/21,051.47
  6. Step 6: Final answer
    x = 28,006.70

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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.