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Finding the Fourth Proportional to 1,108.12, 1,528.99 and 665.86

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Solution

The fourth proportional to 1,108.12, 1,528.99 and 665.86 is: 918.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.12 : 1,528.99 = 665.86 : x
  2. Step 2: Convert to fraction form
    1,108.12/1,528.99 = 665.86/x
  3. Step 3: Cross multiply
    1,108.12x = 1,528.99 × 665.86
  4. Step 4: Simplify right side
    1,108.12x = 1,018,093.28
  5. Step 5: Solve for x
    x = 1,018,093.28/1,108.12
  6. Step 6: Final answer
    x = 918.76

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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.