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Finding the Fourth Proportional to 869,403.40, 1,304,493.90 and 308,840.20

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Solution

The fourth proportional to 869,403.40, 1,304,493.90 and 308,840.20 is: 463,398.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    869,403.40 : 1,304,493.90 = 308,840.20 : x
  2. Step 2: Convert to fraction form
    869,403.40/1,304,493.90 = 308,840.20/x
  3. Step 3: Cross multiply
    869,403.40x = 1,304,493.90 × 308,840.20
  4. Step 4: Simplify right side
    869,403.40x = 402,880,156,974.78
  5. Step 5: Solve for x
    x = 402,880,156,974.78/869,403.40
  6. Step 6: Final answer
    x = 463,398.41

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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.