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Finding the Fourth Proportional to 18,975.21, 28,462.77 and 5,124.21

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Solution

The fourth proportional to 18,975.21, 28,462.77 and 5,124.21 is: 7,686.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,975.21 : 28,462.77 = 5,124.21 : x
  2. Step 2: Convert to fraction form
    18,975.21/28,462.77 = 5,124.21/x
  3. Step 3: Cross multiply
    18,975.21x = 28,462.77 × 5,124.21
  4. Step 4: Simplify right side
    18,975.21x = 145,849,210.66
  5. Step 5: Solve for x
    x = 145,849,210.66/18,975.21
  6. Step 6: Final answer
    x = 7,686.30

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1.5x scale

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.