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Finding the Fourth Proportional to 948.46, 1,308.90 and 555.49

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Solution

The fourth proportional to 948.46, 1,308.90 and 555.49 is: 766.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.46 : 1,308.90 = 555.49 : x
  2. Step 2: Convert to fraction form
    948.46/1,308.90 = 555.49/x
  3. Step 3: Cross multiply
    948.46x = 1,308.90 × 555.49
  4. Step 4: Simplify right side
    948.46x = 727,080.86
  5. Step 5: Solve for x
    x = 727,080.86/948.46
  6. Step 6: Final answer
    x = 766.59

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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.