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Finding the Fourth Proportional to 813,187.80, 1,218,906.90 and 307,553.40

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Solution

The fourth proportional to 813,187.80, 1,218,906.90 and 307,553.40 is: 460,999.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,187.80 : 1,218,906.90 = 307,553.40 : x
  2. Step 2: Convert to fraction form
    813,187.80/1,218,906.90 = 307,553.40/x
  3. Step 3: Cross multiply
    813,187.80x = 1,218,906.90 × 307,553.40
  4. Step 4: Simplify right side
    813,187.80x = 374,878,961,378.46
  5. Step 5: Solve for x
    x = 374,878,961,378.46/813,187.80
  6. Step 6: Final answer
    x = 460,999.24

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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.