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Finding the Fourth Proportional to 854.70, 1,282.19 and 421.62

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Solution

The fourth proportional to 854.70, 1,282.19 and 421.62 is: 632.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.70 : 1,282.19 = 421.62 : x
  2. Step 2: Convert to fraction form
    854.70/1,282.19 = 421.62/x
  3. Step 3: Cross multiply
    854.70x = 1,282.19 × 421.62
  4. Step 4: Simplify right side
    854.70x = 540,594.84
  5. Step 5: Solve for x
    x = 540,594.84/854.70
  6. Step 6: Final answer
    x = 632.50

Related Problems

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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.