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Finding the Fourth Proportional to 847.02, 1,268.66 and 521.40

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Solution

The fourth proportional to 847.02, 1,268.66 and 521.40 is: 780.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.02 : 1,268.66 = 521.40 : x
  2. Step 2: Convert to fraction form
    847.02/1,268.66 = 521.40/x
  3. Step 3: Cross multiply
    847.02x = 1,268.66 × 521.40
  4. Step 4: Simplify right side
    847.02x = 661,479.32
  5. Step 5: Solve for x
    x = 661,479.32/847.02
  6. Step 6: Final answer
    x = 780.95

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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.