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Finding the Fourth Proportional to 790.98, 1,088.06 and 643.28

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Solution

The fourth proportional to 790.98, 1,088.06 and 643.28 is: 884.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.98 : 1,088.06 = 643.28 : x
  2. Step 2: Convert to fraction form
    790.98/1,088.06 = 643.28/x
  3. Step 3: Cross multiply
    790.98x = 1,088.06 × 643.28
  4. Step 4: Simplify right side
    790.98x = 699,927.24
  5. Step 5: Solve for x
    x = 699,927.24/790.98
  6. Step 6: Final answer
    x = 884.89

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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.