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Finding the Fourth Proportional to 1,041.95, 1,439.07 and 709.80

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Solution

The fourth proportional to 1,041.95, 1,439.07 and 709.80 is: 980.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,041.95 : 1,439.07 = 709.80 : x
  2. Step 2: Convert to fraction form
    1,041.95/1,439.07 = 709.80/x
  3. Step 3: Cross multiply
    1,041.95x = 1,439.07 × 709.80
  4. Step 4: Simplify right side
    1,041.95x = 1,021,451.89
  5. Step 5: Solve for x
    x = 1,021,451.89/1,041.95
  6. Step 6: Final answer
    x = 980.33

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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.