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Finding the Fourth Proportional to 1,875.95, 2,813.31 and 780.02

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Solution

The fourth proportional to 1,875.95, 2,813.31 and 780.02 is: 1,169.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,875.95 : 2,813.31 = 780.02 : x
  2. Step 2: Convert to fraction form
    1,875.95/2,813.31 = 780.02/x
  3. Step 3: Cross multiply
    1,875.95x = 2,813.31 × 780.02
  4. Step 4: Simplify right side
    1,875.95x = 2,194,438.07
  5. Step 5: Solve for x
    x = 2,194,438.07/1,875.95
  6. Step 6: Final answer
    x = 1,169.77

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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.