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Finding the Fourth Proportional to 1,210.65, 1,671.21 and 818.21

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Solution

The fourth proportional to 1,210.65, 1,671.21 and 818.21 is: 1,129.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.65 : 1,671.21 = 818.21 : x
  2. Step 2: Convert to fraction form
    1,210.65/1,671.21 = 818.21/x
  3. Step 3: Cross multiply
    1,210.65x = 1,671.21 × 818.21
  4. Step 4: Simplify right side
    1,210.65x = 1,367,392.38
  5. Step 5: Solve for x
    x = 1,367,392.38/1,210.65
  6. Step 6: Final answer
    x = 1,129.47

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Half scale
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Double 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.