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Finding the Fourth Proportional to 1,008,440, 1,391,647.20 and 555,731

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Solution

The fourth proportional to 1,008,440, 1,391,647.20 and 555,731 is: 766,908.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008,440 : 1,391,647.20 = 555,731 : x
  2. Step 2: Convert to fraction form
    1,008,440/1,391,647.20 = 555,731/x
  3. Step 3: Cross multiply
    1,008,440x = 1,391,647.20 × 555,731
  4. Step 4: Simplify right side
    1,008,440x = 773,381,490,103.20
  5. Step 5: Solve for x
    x = 773,381,490,103.20/1,008,440
  6. Step 6: Final answer
    x = 766,908.78

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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.