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Finding the Fourth Proportional to 931.51, 1,285.45 and 511.84

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Solution

The fourth proportional to 931.51, 1,285.45 and 511.84 is: 706.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.51 : 1,285.45 = 511.84 : x
  2. Step 2: Convert to fraction form
    931.51/1,285.45 = 511.84/x
  3. Step 3: Cross multiply
    931.51x = 1,285.45 × 511.84
  4. Step 4: Simplify right side
    931.51x = 657,944.73
  5. Step 5: Solve for x
    x = 657,944.73/931.51
  6. Step 6: Final answer
    x = 706.32

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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.