Home / 21,428.69-32,130.72-11,421.11

Finding the Fourth Proportional to 21,428.69, 32,130.72 and 11,421.11

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Solution

The fourth proportional to 21,428.69, 32,130.72 and 11,421.11 is: 17,125.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,428.69 : 32,130.72 = 11,421.11 : x
  2. Step 2: Convert to fraction form
    21,428.69/32,130.72 = 11,421.11/x
  3. Step 3: Cross multiply
    21,428.69x = 32,130.72 × 11,421.11
  4. Step 4: Simplify right side
    21,428.69x = 366,968,487.50
  5. Step 5: Solve for x
    x = 366,968,487.50/21,428.69
  6. Step 6: Final answer
    x = 17,125.10

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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.