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Finding the Fourth Proportional to 969.40, 1,337.80 and 555.48

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Solution

The fourth proportional to 969.40, 1,337.80 and 555.48 is: 766.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.40 : 1,337.80 = 555.48 : x
  2. Step 2: Convert to fraction form
    969.40/1,337.80 = 555.48/x
  3. Step 3: Cross multiply
    969.40x = 1,337.80 × 555.48
  4. Step 4: Simplify right side
    969.40x = 743,119.88
  5. Step 5: Solve for x
    x = 743,119.88/969.40
  6. Step 6: Final answer
    x = 766.58

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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.