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Finding the Fourth Proportional to 883.70, 1,325.51 and 421.80

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Solution

The fourth proportional to 883.70, 1,325.51 and 421.80 is: 632.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.70 : 1,325.51 = 421.80 : x
  2. Step 2: Convert to fraction form
    883.70/1,325.51 = 421.80/x
  3. Step 3: Cross multiply
    883.70x = 1,325.51 × 421.80
  4. Step 4: Simplify right side
    883.70x = 559,094.62
  5. Step 5: Solve for x
    x = 559,094.62/883.70
  6. Step 6: Final answer
    x = 632.68

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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.