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Finding the Fourth Proportional to 1,875.50, 2,811.32 and 780.50

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Solution

The fourth proportional to 1,875.50, 2,811.32 and 780.50 is: 1,169.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,875.50 : 2,811.32 = 780.50 : x
  2. Step 2: Convert to fraction form
    1,875.50/2,811.32 = 780.50/x
  3. Step 3: Cross multiply
    1,875.50x = 2,811.32 × 780.50
  4. Step 4: Simplify right side
    1,875.50x = 2,194,235.26
  5. Step 5: Solve for x
    x = 2,194,235.26/1,875.50
  6. Step 6: Final answer
    x = 1,169.95

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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.