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Finding the Fourth Proportional to 918.63, 1,267.65 and 525.78

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Solution

The fourth proportional to 918.63, 1,267.65 and 525.78 is: 725.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.63 : 1,267.65 = 525.78 : x
  2. Step 2: Convert to fraction form
    918.63/1,267.65 = 525.78/x
  3. Step 3: Cross multiply
    918.63x = 1,267.65 × 525.78
  4. Step 4: Simplify right side
    918.63x = 666,505.02
  5. Step 5: Solve for x
    x = 666,505.02/918.63
  6. Step 6: Final answer
    x = 725.54

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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.