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Finding the Fourth Proportional to 630.21, 869.70 and 346.62

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Solution

The fourth proportional to 630.21, 869.70 and 346.62 is: 478.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.21 : 869.70 = 346.62 : x
  2. Step 2: Convert to fraction form
    630.21/869.70 = 346.62/x
  3. Step 3: Cross multiply
    630.21x = 869.70 × 346.62
  4. Step 4: Simplify right side
    630.21x = 301,455.41
  5. Step 5: Solve for x
    x = 301,455.41/630.21
  6. Step 6: Final answer
    x = 478.34

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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.