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Finding the Fourth Proportional to 917.92, 1,368.05 and 891.28

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Solution

The fourth proportional to 917.92, 1,368.05 and 891.28 is: 1,328.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.92 : 1,368.05 = 891.28 : x
  2. Step 2: Convert to fraction form
    917.92/1,368.05 = 891.28/x
  3. Step 3: Cross multiply
    917.92x = 1,368.05 × 891.28
  4. Step 4: Simplify right side
    917.92x = 1,219,315.60
  5. Step 5: Solve for x
    x = 1,219,315.60/917.92
  6. Step 6: Final answer
    x = 1,328.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.