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Finding the Fourth Proportional to 908.04, 1,361.72 and 421.10

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Solution

The fourth proportional to 908.04, 1,361.72 and 421.10 is: 631.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.04 : 1,361.72 = 421.10 : x
  2. Step 2: Convert to fraction form
    908.04/1,361.72 = 421.10/x
  3. Step 3: Cross multiply
    908.04x = 1,361.72 × 421.10
  4. Step 4: Simplify right side
    908.04x = 573,420.29
  5. Step 5: Solve for x
    x = 573,420.29/908.04
  6. Step 6: Final answer
    x = 631.49

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Half scale
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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.