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Finding the Fourth Proportional to 2,866.60, 4,299.80 and 918.76

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Solution

The fourth proportional to 2,866.60, 4,299.80 and 918.76 is: 1,378.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,866.60 : 4,299.80 = 918.76 : x
  2. Step 2: Convert to fraction form
    2,866.60/4,299.80 = 918.76/x
  3. Step 3: Cross multiply
    2,866.60x = 4,299.80 × 918.76
  4. Step 4: Simplify right side
    2,866.60x = 3,950,484.25
  5. Step 5: Solve for x
    x = 3,950,484.25/2,866.60
  6. Step 6: Final answer
    x = 1,378.11

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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.