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Finding the Fourth Proportional to 20,978.47, 28,950.29 and 11,547.03

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Solution

The fourth proportional to 20,978.47, 28,950.29 and 11,547.03 is: 15,934.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,978.47 : 28,950.29 = 11,547.03 : x
  2. Step 2: Convert to fraction form
    20,978.47/28,950.29 = 11,547.03/x
  3. Step 3: Cross multiply
    20,978.47x = 28,950.29 × 11,547.03
  4. Step 4: Simplify right side
    20,978.47x = 334,289,809.40
  5. Step 5: Solve for x
    x = 334,289,809.40/20,978.47
  6. Step 6: Final answer
    x = 15,934.90

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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.