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Finding the Fourth Proportional to 30,648.99, 42,300.51 and 28,647.87

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Solution

The fourth proportional to 30,648.99, 42,300.51 and 28,647.87 is: 39,538.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,648.99 : 42,300.51 = 28,647.87 : x
  2. Step 2: Convert to fraction form
    30,648.99/42,300.51 = 28,647.87/x
  3. Step 3: Cross multiply
    30,648.99x = 42,300.51 × 28,647.87
  4. Step 4: Simplify right side
    30,648.99x = 1,211,819,511.41
  5. Step 5: Solve for x
    x = 1,211,819,511.41/30,648.99
  6. Step 6: Final answer
    x = 39,538.64

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1.5x scale

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.