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Finding the Fourth Proportional to 918.79, 1,267.77 and 520.43

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Solution

The fourth proportional to 918.79, 1,267.77 and 520.43 is: 718.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.79 : 1,267.77 = 520.43 : x
  2. Step 2: Convert to fraction form
    918.79/1,267.77 = 520.43/x
  3. Step 3: Cross multiply
    918.79x = 1,267.77 × 520.43
  4. Step 4: Simplify right side
    918.79x = 659,788.71
  5. Step 5: Solve for x
    x = 659,788.71/918.79
  6. Step 6: Final answer
    x = 718.11

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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.