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Finding the Fourth Proportional to 1,368.91, 1,888.95 and 809.41

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Solution

The fourth proportional to 1,368.91, 1,888.95 and 809.41 is: 1,116.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.91 : 1,888.95 = 809.41 : x
  2. Step 2: Convert to fraction form
    1,368.91/1,888.95 = 809.41/x
  3. Step 3: Cross multiply
    1,368.91x = 1,888.95 × 809.41
  4. Step 4: Simplify right side
    1,368.91x = 1,528,925.57
  5. Step 5: Solve for x
    x = 1,528,925.57/1,368.91
  6. Step 6: Final answer
    x = 1,116.89

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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.