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Finding the Fourth Proportional to 917.60, 1,266.81 and 696.16

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Solution

The fourth proportional to 917.60, 1,266.81 and 696.16 is: 961.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.60 : 1,266.81 = 696.16 : x
  2. Step 2: Convert to fraction form
    917.60/1,266.81 = 696.16/x
  3. Step 3: Cross multiply
    917.60x = 1,266.81 × 696.16
  4. Step 4: Simplify right side
    917.60x = 881,907.30
  5. Step 5: Solve for x
    x = 881,907.30/917.60
  6. Step 6: Final answer
    x = 961.11

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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.