Home / 8,970.76-12,378.42-4,991.36

Finding the Fourth Proportional to 8,970.76, 12,378.42 and 4,991.36

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Solution

The fourth proportional to 8,970.76, 12,378.42 and 4,991.36 is: 6,887.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,970.76 : 12,378.42 = 4,991.36 : x
  2. Step 2: Convert to fraction form
    8,970.76/12,378.42 = 4,991.36/x
  3. Step 3: Cross multiply
    8,970.76x = 12,378.42 × 4,991.36
  4. Step 4: Simplify right side
    8,970.76x = 61,785,150.45
  5. Step 5: Solve for x
    x = 61,785,150.45/8,970.76
  6. Step 6: Final answer
    x = 6,887.39

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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.