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Finding the Fourth Proportional to 917.02, 1,373.59 and 721.09

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Solution

The fourth proportional to 917.02, 1,373.59 and 721.09 is: 1,080.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.02 : 1,373.59 = 721.09 : x
  2. Step 2: Convert to fraction form
    917.02/1,373.59 = 721.09/x
  3. Step 3: Cross multiply
    917.02x = 1,373.59 × 721.09
  4. Step 4: Simplify right side
    917.02x = 990,483.64
  5. Step 5: Solve for x
    x = 990,483.64/917.02
  6. Step 6: Final answer
    x = 1,080.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.