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Finding the Fourth Proportional to 642,816.69, 887,027.40 and 356,312.40

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Solution

The fourth proportional to 642,816.69, 887,027.40 and 356,312.40 is: 491,678.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,816.69 : 887,027.40 = 356,312.40 : x
  2. Step 2: Convert to fraction form
    642,816.69/887,027.40 = 356,312.40/x
  3. Step 3: Cross multiply
    642,816.69x = 887,027.40 × 356,312.40
  4. Step 4: Simplify right side
    642,816.69x = 316,058,861,759.76
  5. Step 5: Solve for x
    x = 316,058,861,759.76/642,816.69
  6. Step 6: Final answer
    x = 491,678.06

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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.