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Finding the Fourth Proportional to 947.95, 1,308.20 and 555.21

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Solution

The fourth proportional to 947.95, 1,308.20 and 555.21 is: 766.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.95 : 1,308.20 = 555.21 : x
  2. Step 2: Convert to fraction form
    947.95/1,308.20 = 555.21/x
  3. Step 3: Cross multiply
    947.95x = 1,308.20 × 555.21
  4. Step 4: Simplify right side
    947.95x = 726,322.95
  5. Step 5: Solve for x
    x = 726,322.95/947.95
  6. Step 6: Final answer
    x = 766.21

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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.