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Finding the Fourth Proportional to 940.92, 1,411.55 and 420.94

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Solution

The fourth proportional to 940.92, 1,411.55 and 420.94 is: 631.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.92 : 1,411.55 = 420.94 : x
  2. Step 2: Convert to fraction form
    940.92/1,411.55 = 420.94/x
  3. Step 3: Cross multiply
    940.92x = 1,411.55 × 420.94
  4. Step 4: Simplify right side
    940.92x = 594,178.91
  5. Step 5: Solve for x
    x = 594,178.91/940.92
  6. Step 6: Final answer
    x = 631.49

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.