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Finding the Fourth Proportional to 918.15, 1,265.55 and 623.31

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Solution

The fourth proportional to 918.15, 1,265.55 and 623.31 is: 859.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.15 : 1,265.55 = 623.31 : x
  2. Step 2: Convert to fraction form
    918.15/1,265.55 = 623.31/x
  3. Step 3: Cross multiply
    918.15x = 1,265.55 × 623.31
  4. Step 4: Simplify right side
    918.15x = 788,829.97
  5. Step 5: Solve for x
    x = 788,829.97/918.15
  6. Step 6: Final answer
    x = 859.15

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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.