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Finding the Fourth Proportional to 917.25, 1,263.84 and 621.99

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Solution

The fourth proportional to 917.25, 1,263.84 and 621.99 is: 857.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.25 : 1,263.84 = 621.99 : x
  2. Step 2: Convert to fraction form
    917.25/1,263.84 = 621.99/x
  3. Step 3: Cross multiply
    917.25x = 1,263.84 × 621.99
  4. Step 4: Simplify right side
    917.25x = 786,095.84
  5. Step 5: Solve for x
    x = 786,095.84/917.25
  6. Step 6: Final answer
    x = 857.01

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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.