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Finding the Fourth Proportional to 1,376.16, 1,898.64 and 786.28

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Solution

The fourth proportional to 1,376.16, 1,898.64 and 786.28 is: 1,084.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.16 : 1,898.64 = 786.28 : x
  2. Step 2: Convert to fraction form
    1,376.16/1,898.64 = 786.28/x
  3. Step 3: Cross multiply
    1,376.16x = 1,898.64 × 786.28
  4. Step 4: Simplify right side
    1,376.16x = 1,492,862.66
  5. Step 5: Solve for x
    x = 1,492,862.66/1,376.16
  6. Step 6: Final answer
    x = 1,084.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.