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Finding the Fourth Proportional to 1,439.07, 1,985.87 and 809.62

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Solution

The fourth proportional to 1,439.07, 1,985.87 and 809.62 is: 1,117.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.07 : 1,985.87 = 809.62 : x
  2. Step 2: Convert to fraction form
    1,439.07/1,985.87 = 809.62/x
  3. Step 3: Cross multiply
    1,439.07x = 1,985.87 × 809.62
  4. Step 4: Simplify right side
    1,439.07x = 1,607,796.02
  5. Step 5: Solve for x
    x = 1,607,796.02/1,439.07
  6. Step 6: Final answer
    x = 1,117.25

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1.5x scale

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.