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Finding the Fourth Proportional to 948.50, 1,308.98 and 555.45

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Solution

The fourth proportional to 948.50, 1,308.98 and 555.45 is: 766.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.50 : 1,308.98 = 555.45 : x
  2. Step 2: Convert to fraction form
    948.50/1,308.98 = 555.45/x
  3. Step 3: Cross multiply
    948.50x = 1,308.98 × 555.45
  4. Step 4: Simplify right side
    948.50x = 727,072.94
  5. Step 5: Solve for x
    x = 727,072.94/948.50
  6. Step 6: Final answer
    x = 766.55

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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.