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Finding the Fourth Proportional to 912.75, 1,260.12 and 618.45

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Solution

The fourth proportional to 912.75, 1,260.12 and 618.45 is: 853.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.75 : 1,260.12 = 618.45 : x
  2. Step 2: Convert to fraction form
    912.75/1,260.12 = 618.45/x
  3. Step 3: Cross multiply
    912.75x = 1,260.12 × 618.45
  4. Step 4: Simplify right side
    912.75x = 779,321.21
  5. Step 5: Solve for x
    x = 779,321.21/912.75
  6. Step 6: Final answer
    x = 853.82

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Half scale
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1.5x scale

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.