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Finding the Fourth Proportional to 916,921.40, 1,372,757.70 and 811,945.40

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Solution

The fourth proportional to 916,921.40, 1,372,757.70 and 811,945.40 is: 1,215,594.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    916,921.40 : 1,372,757.70 = 811,945.40 : x
  2. Step 2: Convert to fraction form
    916,921.40/1,372,757.70 = 811,945.40/x
  3. Step 3: Cross multiply
    916,921.40x = 1,372,757.70 × 811,945.40
  4. Step 4: Simplify right side
    916,921.40x = 1,114,604,299,829.58
  5. Step 5: Solve for x
    x = 1,114,604,299,829.58/916,921.40
  6. Step 6: Final answer
    x = 1,215,594.16

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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.