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Finding the Fourth Proportional to 1,376.60, 1,899.71 and 817.34

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Solution

The fourth proportional to 1,376.60, 1,899.71 and 817.34 is: 1,127.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.60 : 1,899.71 = 817.34 : x
  2. Step 2: Convert to fraction form
    1,376.60/1,899.71 = 817.34/x
  3. Step 3: Cross multiply
    1,376.60x = 1,899.71 × 817.34
  4. Step 4: Simplify right side
    1,376.60x = 1,552,708.97
  5. Step 5: Solve for x
    x = 1,552,708.97/1,376.60
  6. Step 6: Final answer
    x = 1,127.93

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1.5x scale

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.