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Finding the Fourth Proportional to 948.57, 1,308.99 and 555.65

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Solution

The fourth proportional to 948.57, 1,308.99 and 555.65 is: 766.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.57 : 1,308.99 = 555.65 : x
  2. Step 2: Convert to fraction form
    948.57/1,308.99 = 555.65/x
  3. Step 3: Cross multiply
    948.57x = 1,308.99 × 555.65
  4. Step 4: Simplify right side
    948.57x = 727,340.29
  5. Step 5: Solve for x
    x = 727,340.29/948.57
  6. Step 6: Final answer
    x = 766.78

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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.