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Finding the Fourth Proportional to 8,435.80, 12,664.10 and 5,315.80

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Solution

The fourth proportional to 8,435.80, 12,664.10 and 5,315.80 is: 7,980.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,435.80 : 12,664.10 = 5,315.80 : x
  2. Step 2: Convert to fraction form
    8,435.80/12,664.10 = 5,315.80/x
  3. Step 3: Cross multiply
    8,435.80x = 12,664.10 × 5,315.80
  4. Step 4: Simplify right side
    8,435.80x = 67,319,822.78
  5. Step 5: Solve for x
    x = 67,319,822.78/8,435.80
  6. Step 6: Final answer
    x = 7,980.25

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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.