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Finding the Fourth Proportional to 1,221.96, 1,687.02 and 802.98

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Solution

The fourth proportional to 1,221.96, 1,687.02 and 802.98 is: 1,108.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.96 : 1,687.02 = 802.98 : x
  2. Step 2: Convert to fraction form
    1,221.96/1,687.02 = 802.98/x
  3. Step 3: Cross multiply
    1,221.96x = 1,687.02 × 802.98
  4. Step 4: Simplify right side
    1,221.96x = 1,354,643.32
  5. Step 5: Solve for x
    x = 1,354,643.32/1,221.96
  6. Step 6: Final answer
    x = 1,108.58

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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.