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Finding the Fourth Proportional to 916,923.90, 1,372,761.45 and 811,947.90

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Solution

The fourth proportional to 916,923.90, 1,372,761.45 and 811,947.90 is: 1,215,597.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    916,923.90 : 1,372,761.45 = 811,947.90 : x
  2. Step 2: Convert to fraction form
    916,923.90/1,372,761.45 = 811,947.90/x
  3. Step 3: Cross multiply
    916,923.90x = 1,372,761.45 × 811,947.90
  4. Step 4: Simplify right side
    916,923.90x = 1,114,610,776,528.46
  5. Step 5: Solve for x
    x = 1,114,610,776,528.46/916,923.90
  6. Step 6: Final answer
    x = 1,215,597.91

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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.