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Finding the Fourth Proportional to 671.51, 930.63 and 661.26

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Solution

The fourth proportional to 671.51, 930.63 and 661.26 is: 916.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.51 : 930.63 = 661.26 : x
  2. Step 2: Convert to fraction form
    671.51/930.63 = 661.26/x
  3. Step 3: Cross multiply
    671.51x = 930.63 × 661.26
  4. Step 4: Simplify right side
    671.51x = 615,388.39
  5. Step 5: Solve for x
    x = 615,388.39/671.51
  6. Step 6: Final answer
    x = 916.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.