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Finding the Fourth Proportional to 1,045.69, 1,442.53 and 811.19

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Solution

The fourth proportional to 1,045.69, 1,442.53 and 811.19 is: 1,119.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,045.69 : 1,442.53 = 811.19 : x
  2. Step 2: Convert to fraction form
    1,045.69/1,442.53 = 811.19/x
  3. Step 3: Cross multiply
    1,045.69x = 1,442.53 × 811.19
  4. Step 4: Simplify right side
    1,045.69x = 1,170,165.91
  5. Step 5: Solve for x
    x = 1,170,165.91/1,045.69
  6. Step 6: Final answer
    x = 1,119.04

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Half scale
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Double scale
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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.