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Finding the Fourth Proportional to 989.30, 1,364.54 and 802.79

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Solution

The fourth proportional to 989.30, 1,364.54 and 802.79 is: 1,107.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.30 : 1,364.54 = 802.79 : x
  2. Step 2: Convert to fraction form
    989.30/1,364.54 = 802.79/x
  3. Step 3: Cross multiply
    989.30x = 1,364.54 × 802.79
  4. Step 4: Simplify right side
    989.30x = 1,095,428.23
  5. Step 5: Solve for x
    x = 1,095,428.23/989.30
  6. Step 6: Final answer
    x = 1,107.28

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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.