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Finding the Fourth Proportional to 1,878.32, 2,815.04 and 782.08

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Solution

The fourth proportional to 1,878.32, 2,815.04 and 782.08 is: 1,172.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.32 : 2,815.04 = 782.08 : x
  2. Step 2: Convert to fraction form
    1,878.32/2,815.04 = 782.08/x
  3. Step 3: Cross multiply
    1,878.32x = 2,815.04 × 782.08
  4. Step 4: Simplify right side
    1,878.32x = 2,201,586.48
  5. Step 5: Solve for x
    x = 2,201,586.48/1,878.32
  6. Step 6: Final answer
    x = 1,172.10

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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.