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Finding the Fourth Proportional to 1,085.44, 1,498.35 and 665.86

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Solution

The fourth proportional to 1,085.44, 1,498.35 and 665.86 is: 919.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.44 : 1,498.35 = 665.86 : x
  2. Step 2: Convert to fraction form
    1,085.44/1,498.35 = 665.86/x
  3. Step 3: Cross multiply
    1,085.44x = 1,498.35 × 665.86
  4. Step 4: Simplify right side
    1,085.44x = 997,691.33
  5. Step 5: Solve for x
    x = 997,691.33/1,085.44
  6. Step 6: Final answer
    x = 919.16

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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.