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Finding the Fourth Proportional to 643,156.65, 887,610.74 and 356,769

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Solution

The fourth proportional to 643,156.65, 887,610.74 and 356,769 is: 492,371.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,156.65 : 887,610.74 = 356,769 : x
  2. Step 2: Convert to fraction form
    643,156.65/887,610.74 = 356,769/x
  3. Step 3: Cross multiply
    643,156.65x = 887,610.74 × 356,769
  4. Step 4: Simplify right side
    643,156.65x = 316,671,994,315.22
  5. Step 5: Solve for x
    x = 316,671,994,315.22/643,156.65
  6. Step 6: Final answer
    x = 492,371.48

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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.