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Finding the Fourth Proportional to 930.58, 1,284.06 and 557.49

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Solution

The fourth proportional to 930.58, 1,284.06 and 557.49 is: 769.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.58 : 1,284.06 = 557.49 : x
  2. Step 2: Convert to fraction form
    930.58/1,284.06 = 557.49/x
  3. Step 3: Cross multiply
    930.58x = 1,284.06 × 557.49
  4. Step 4: Simplify right side
    930.58x = 715,850.61
  5. Step 5: Solve for x
    x = 715,850.61/930.58
  6. Step 6: Final answer
    x = 769.25

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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.