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Finding the Fourth Proportional to 807.40, 1,210.62 and 259.60

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Solution

The fourth proportional to 807.40, 1,210.62 and 259.60 is: 389.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.40 : 1,210.62 = 259.60 : x
  2. Step 2: Convert to fraction form
    807.40/1,210.62 = 259.60/x
  3. Step 3: Cross multiply
    807.40x = 1,210.62 × 259.60
  4. Step 4: Simplify right side
    807.40x = 314,276.95
  5. Step 5: Solve for x
    x = 314,276.95/807.40
  6. Step 6: Final answer
    x = 389.25

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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.