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Finding the Fourth Proportional to 918.07, 1,377.54 and 455.89

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Solution

The fourth proportional to 918.07, 1,377.54 and 455.89 is: 684.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.07 : 1,377.54 = 455.89 : x
  2. Step 2: Convert to fraction form
    918.07/1,377.54 = 455.89/x
  3. Step 3: Cross multiply
    918.07x = 1,377.54 × 455.89
  4. Step 4: Simplify right side
    918.07x = 628,006.71
  5. Step 5: Solve for x
    x = 628,006.71/918.07
  6. Step 6: Final answer
    x = 684.05

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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.