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Finding the Fourth Proportional to 1,875.58, 2,813.47 and 780.05

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Solution

The fourth proportional to 1,875.58, 2,813.47 and 780.05 is: 1,170.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,875.58 : 2,813.47 = 780.05 : x
  2. Step 2: Convert to fraction form
    1,875.58/2,813.47 = 780.05/x
  3. Step 3: Cross multiply
    1,875.58x = 2,813.47 × 780.05
  4. Step 4: Simplify right side
    1,875.58x = 2,194,652.36
  5. Step 5: Solve for x
    x = 2,194,652.36/1,875.58
  6. Step 6: Final answer
    x = 1,170.12

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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.