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Finding the Fourth Proportional to 830.07, 1,145.43 and 480.78

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Solution

The fourth proportional to 830.07, 1,145.43 and 480.78 is: 663.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.07 : 1,145.43 = 480.78 : x
  2. Step 2: Convert to fraction form
    830.07/1,145.43 = 480.78/x
  3. Step 3: Cross multiply
    830.07x = 1,145.43 × 480.78
  4. Step 4: Simplify right side
    830.07x = 550,699.84
  5. Step 5: Solve for x
    x = 550,699.84/830.07
  6. Step 6: Final answer
    x = 663.44

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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.