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Finding the Fourth Proportional to 918.80, 1,378.56 and 333.98

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Solution

The fourth proportional to 918.80, 1,378.56 and 333.98 is: 501.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.80 : 1,378.56 = 333.98 : x
  2. Step 2: Convert to fraction form
    918.80/1,378.56 = 333.98/x
  3. Step 3: Cross multiply
    918.80x = 1,378.56 × 333.98
  4. Step 4: Simplify right side
    918.80x = 460,411.47
  5. Step 5: Solve for x
    x = 460,411.47/918.80
  6. Step 6: Final answer
    x = 501.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.