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Finding the Fourth Proportional to 8,612.84, 12,913.39 and 4,385.70

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Solution

The fourth proportional to 8,612.84, 12,913.39 and 4,385.70 is: 6,575.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,612.84 : 12,913.39 = 4,385.70 : x
  2. Step 2: Convert to fraction form
    8,612.84/12,913.39 = 4,385.70/x
  3. Step 3: Cross multiply
    8,612.84x = 12,913.39 × 4,385.70
  4. Step 4: Simplify right side
    8,612.84x = 56,634,254.52
  5. Step 5: Solve for x
    x = 56,634,254.52/8,612.84
  6. Step 6: Final answer
    x = 6,575.56

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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.