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Finding the Fourth Proportional to 948.12, 1,307.79 and 555

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Solution

The fourth proportional to 948.12, 1,307.79 and 555 is: 765.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.12 : 1,307.79 = 555 : x
  2. Step 2: Convert to fraction form
    948.12/1,307.79 = 555/x
  3. Step 3: Cross multiply
    948.12x = 1,307.79 × 555
  4. Step 4: Simplify right side
    948.12x = 725,823.45
  5. Step 5: Solve for x
    x = 725,823.45/948.12
  6. Step 6: Final answer
    x = 765.54

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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.