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Finding the Fourth Proportional to 1,698.45, 2,345.00 and 1,108.77

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Solution

The fourth proportional to 1,698.45, 2,345.00 and 1,108.77 is: 1,530.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,698.45 : 2,345.00 = 1,108.77 : x
  2. Step 2: Convert to fraction form
    1,698.45/2,345.00 = 1,108.77/x
  3. Step 3: Cross multiply
    1,698.45x = 2,345.00 × 1,108.77
  4. Step 4: Simplify right side
    1,698.45x = 2,600,060.11
  5. Step 5: Solve for x
    x = 2,600,060.11/1,698.45
  6. Step 6: Final answer
    x = 1,530.84

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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.