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Finding the Fourth Proportional to 918.99, 1,267.77 and 525.79

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Solution

The fourth proportional to 918.99, 1,267.77 and 525.79 is: 725.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.99 : 1,267.77 = 525.79 : x
  2. Step 2: Convert to fraction form
    918.99/1,267.77 = 525.79/x
  3. Step 3: Cross multiply
    918.99x = 1,267.77 × 525.79
  4. Step 4: Simplify right side
    918.99x = 666,574.45
  5. Step 5: Solve for x
    x = 666,574.45/918.99
  6. Step 6: Final answer
    x = 725.33

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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.