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Finding the Fourth Proportional to 930.96, 1,284.76 and 558.16

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Solution

The fourth proportional to 930.96, 1,284.76 and 558.16 is: 770.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.96 : 1,284.76 = 558.16 : x
  2. Step 2: Convert to fraction form
    930.96/1,284.76 = 558.16/x
  3. Step 3: Cross multiply
    930.96x = 1,284.76 × 558.16
  4. Step 4: Simplify right side
    930.96x = 717,099.13
  5. Step 5: Solve for x
    x = 717,099.13/930.96
  6. Step 6: Final answer
    x = 770.28

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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.