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Finding the Fourth Proportional to 918.72, 1,377.48 and 456.36

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Solution

The fourth proportional to 918.72, 1,377.48 and 456.36 is: 684.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.72 : 1,377.48 = 456.36 : x
  2. Step 2: Convert to fraction form
    918.72/1,377.48 = 456.36/x
  3. Step 3: Cross multiply
    918.72x = 1,377.48 × 456.36
  4. Step 4: Simplify right side
    918.72x = 628,626.77
  5. Step 5: Solve for x
    x = 628,626.77/918.72
  6. Step 6: Final answer
    x = 684.24

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1.5x scale

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.