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Finding the Fourth Proportional to 989.16, 1,364.65 and 910.49

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Solution

The fourth proportional to 989.16, 1,364.65 and 910.49 is: 1,256.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.16 : 1,364.65 = 910.49 : x
  2. Step 2: Convert to fraction form
    989.16/1,364.65 = 910.49/x
  3. Step 3: Cross multiply
    989.16x = 1,364.65 × 910.49
  4. Step 4: Simplify right side
    989.16x = 1,242,498.76
  5. Step 5: Solve for x
    x = 1,242,498.76/989.16
  6. Step 6: Final answer
    x = 1,256.11

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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.