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Finding the Fourth Proportional to 1,875.15, 2,812.71 and 780.28

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Solution

The fourth proportional to 1,875.15, 2,812.71 and 780.28 is: 1,170.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,875.15 : 2,812.71 = 780.28 : x
  2. Step 2: Convert to fraction form
    1,875.15/2,812.71 = 780.28/x
  3. Step 3: Cross multiply
    1,875.15x = 2,812.71 × 780.28
  4. Step 4: Simplify right side
    1,875.15x = 2,194,701.36
  5. Step 5: Solve for x
    x = 2,194,701.36/1,875.15
  6. Step 6: Final answer
    x = 1,170.41

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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.