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Finding the Fourth Proportional to 930.89, 1,284.55 and 511.23

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Solution

The fourth proportional to 930.89, 1,284.55 and 511.23 is: 705.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.89 : 1,284.55 = 511.23 : x
  2. Step 2: Convert to fraction form
    930.89/1,284.55 = 511.23/x
  3. Step 3: Cross multiply
    930.89x = 1,284.55 × 511.23
  4. Step 4: Simplify right side
    930.89x = 656,700.50
  5. Step 5: Solve for x
    x = 656,700.50/930.89
  6. Step 6: Final answer
    x = 705.45

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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.