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Finding the Fourth Proportional to 917.04, 1,265.57 and 720.21

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Solution

The fourth proportional to 917.04, 1,265.57 and 720.21 is: 993.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.04 : 1,265.57 = 720.21 : x
  2. Step 2: Convert to fraction form
    917.04/1,265.57 = 720.21/x
  3. Step 3: Cross multiply
    917.04x = 1,265.57 × 720.21
  4. Step 4: Simplify right side
    917.04x = 911,476.17
  5. Step 5: Solve for x
    x = 911,476.17/917.04
  6. Step 6: Final answer
    x = 993.93

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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.