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Finding the Fourth Proportional to 779.40, 1,168.86 and 521.01

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Solution

The fourth proportional to 779.40, 1,168.86 and 521.01 is: 781.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.40 : 1,168.86 = 521.01 : x
  2. Step 2: Convert to fraction form
    779.40/1,168.86 = 521.01/x
  3. Step 3: Cross multiply
    779.40x = 1,168.86 × 521.01
  4. Step 4: Simplify right side
    779.40x = 608,987.75
  5. Step 5: Solve for x
    x = 608,987.75/779.40
  6. Step 6: Final answer
    x = 781.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.