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Finding the Fourth Proportional to 856.15, 1,283.33 and 621.32

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Solution

The fourth proportional to 856.15, 1,283.33 and 621.32 is: 931.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.15 : 1,283.33 = 621.32 : x
  2. Step 2: Convert to fraction form
    856.15/1,283.33 = 621.32/x
  3. Step 3: Cross multiply
    856.15x = 1,283.33 × 621.32
  4. Step 4: Simplify right side
    856.15x = 797,358.60
  5. Step 5: Solve for x
    x = 797,358.60/856.15
  6. Step 6: Final answer
    x = 931.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.