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Finding the Fourth Proportional to 931.86, 1,285.38 and 558.59

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Solution

The fourth proportional to 931.86, 1,285.38 and 558.59 is: 770.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.86 : 1,285.38 = 558.59 : x
  2. Step 2: Convert to fraction form
    931.86/1,285.38 = 558.59/x
  3. Step 3: Cross multiply
    931.86x = 1,285.38 × 558.59
  4. Step 4: Simplify right side
    931.86x = 717,993.99
  5. Step 5: Solve for x
    x = 717,993.99/931.86
  6. Step 6: Final answer
    x = 770.50

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Double scale
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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.