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Finding the Fourth Proportional to 948.88, 1,309.80 and 556.48

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Solution

The fourth proportional to 948.88, 1,309.80 and 556.48 is: 768.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.88 : 1,309.80 = 556.48 : x
  2. Step 2: Convert to fraction form
    948.88/1,309.80 = 556.48/x
  3. Step 3: Cross multiply
    948.88x = 1,309.80 × 556.48
  4. Step 4: Simplify right side
    948.88x = 728,877.50
  5. Step 5: Solve for x
    x = 728,877.50/948.88
  6. Step 6: Final answer
    x = 768.15

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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.