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Finding the Fourth Proportional to 550,670.88, 760,141.89 and 390,363.78

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Solution

The fourth proportional to 550,670.88, 760,141.89 and 390,363.78 is: 538,855.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    550,670.88 : 760,141.89 = 390,363.78 : x
  2. Step 2: Convert to fraction form
    550,670.88/760,141.89 = 390,363.78/x
  3. Step 3: Cross multiply
    550,670.88x = 760,141.89 × 390,363.78
  4. Step 4: Simplify right side
    550,670.88x = 296,731,861,516.74
  5. Step 5: Solve for x
    x = 296,731,861,516.74/550,670.88
  6. Step 6: Final answer
    x = 538,855.19

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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.