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Finding the Fourth Proportional to 28,851, 39,814.50 and 15,603

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Solution

The fourth proportional to 28,851, 39,814.50 and 15,603 is: 21,532.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,851 : 39,814.50 = 15,603 : x
  2. Step 2: Convert to fraction form
    28,851/39,814.50 = 15,603/x
  3. Step 3: Cross multiply
    28,851x = 39,814.50 × 15,603
  4. Step 4: Simplify right side
    28,851x = 621,225,643.50
  5. Step 5: Solve for x
    x = 621,225,643.50/28,851
  6. Step 6: Final answer
    x = 21,532.20

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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.