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Finding the Fourth Proportional to 930.99, 1,284.78 and 558.24

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Solution

The fourth proportional to 930.99, 1,284.78 and 558.24 is: 770.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.99 : 1,284.78 = 558.24 : x
  2. Step 2: Convert to fraction form
    930.99/1,284.78 = 558.24/x
  3. Step 3: Cross multiply
    930.99x = 1,284.78 × 558.24
  4. Step 4: Simplify right side
    930.99x = 717,215.59
  5. Step 5: Solve for x
    x = 717,215.59/930.99
  6. Step 6: Final answer
    x = 770.38

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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.