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Finding the Fourth Proportional to 931.19, 1,285.01 and 511.52

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Solution

The fourth proportional to 931.19, 1,285.01 and 511.52 is: 705.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.19 : 1,285.01 = 511.52 : x
  2. Step 2: Convert to fraction form
    931.19/1,285.01 = 511.52/x
  3. Step 3: Cross multiply
    931.19x = 1,285.01 × 511.52
  4. Step 4: Simplify right side
    931.19x = 657,299.33
  5. Step 5: Solve for x
    x = 657,299.33/931.19
  6. Step 6: Final answer
    x = 705.87

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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.