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Finding the Fourth Proportional to 829.81, 1,145.12 and 456.78

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Solution

The fourth proportional to 829.81, 1,145.12 and 456.78 is: 630.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.81 : 1,145.12 = 456.78 : x
  2. Step 2: Convert to fraction form
    829.81/1,145.12 = 456.78/x
  3. Step 3: Cross multiply
    829.81x = 1,145.12 × 456.78
  4. Step 4: Simplify right side
    829.81x = 523,068.49
  5. Step 5: Solve for x
    x = 523,068.49/829.81
  6. Step 6: Final answer
    x = 630.35

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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.