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Finding the Fourth Proportional to 959.40, 1,323.98 and 539.78

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Solution

The fourth proportional to 959.40, 1,323.98 and 539.78 is: 744.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.40 : 1,323.98 = 539.78 : x
  2. Step 2: Convert to fraction form
    959.40/1,323.98 = 539.78/x
  3. Step 3: Cross multiply
    959.40x = 1,323.98 × 539.78
  4. Step 4: Simplify right side
    959.40x = 714,657.92
  5. Step 5: Solve for x
    x = 714,657.92/959.40
  6. Step 6: Final answer
    x = 744.90

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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.