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Finding the Fourth Proportional to 28,379.79, 42,569.55 and 8,658.45

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Solution

The fourth proportional to 28,379.79, 42,569.55 and 8,658.45 is: 12,987.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,379.79 : 42,569.55 = 8,658.45 : x
  2. Step 2: Convert to fraction form
    28,379.79/42,569.55 = 8,658.45/x
  3. Step 3: Cross multiply
    28,379.79x = 42,569.55 × 8,658.45
  4. Step 4: Simplify right side
    28,379.79x = 368,586,320.20
  5. Step 5: Solve for x
    x = 368,586,320.20/28,379.79
  6. Step 6: Final answer
    x = 12,987.63

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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.