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Finding the Fourth Proportional to 28,380.40, 42,570.48 and 8,658.90

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Solution

The fourth proportional to 28,380.40, 42,570.48 and 8,658.90 is: 12,988.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,380.40 : 42,570.48 = 8,658.90 : x
  2. Step 2: Convert to fraction form
    28,380.40/42,570.48 = 8,658.90/x
  3. Step 3: Cross multiply
    28,380.40x = 42,570.48 × 8,658.90
  4. Step 4: Simplify right side
    28,380.40x = 368,613,529.27
  5. Step 5: Solve for x
    x = 368,613,529.27/28,380.40
  6. Step 6: Final answer
    x = 12,988.31

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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.