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Finding the Fourth Proportional to 948, 1,307.80 and 554.84

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Solution

The fourth proportional to 948, 1,307.80 and 554.84 is: 765.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    948 : 1,307.80 = 554.84 : x
  2. Step 2: Convert to fraction form
    948/1,307.80 = 554.84/x
  3. Step 3: Cross multiply
    948x = 1,307.80 × 554.84
  4. Step 4: Simplify right side
    948x = 725,619.75
  5. Step 5: Solve for x
    x = 725,619.75/948
  6. Step 6: Final answer
    x = 765.42

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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.