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Finding the Fourth Proportional to 918.69, 1,267.86 and 525.74

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Solution

The fourth proportional to 918.69, 1,267.86 and 525.74 is: 725.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.69 : 1,267.86 = 525.74 : x
  2. Step 2: Convert to fraction form
    918.69/1,267.86 = 525.74/x
  3. Step 3: Cross multiply
    918.69x = 1,267.86 × 525.74
  4. Step 4: Simplify right side
    918.69x = 666,564.72
  5. Step 5: Solve for x
    x = 666,564.72/918.69
  6. Step 6: Final answer
    x = 725.56

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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.