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Finding the Fourth Proportional to 643,158.85, 887,501.06 and 356,678.05

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Solution

The fourth proportional to 643,158.85, 887,501.06 and 356,678.05 is: 492,183.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,158.85 : 887,501.06 = 356,678.05 : x
  2. Step 2: Convert to fraction form
    643,158.85/887,501.06 = 356,678.05/x
  3. Step 3: Cross multiply
    643,158.85x = 887,501.06 × 356,678.05
  4. Step 4: Simplify right side
    643,158.85x = 316,552,145,670.34
  5. Step 5: Solve for x
    x = 316,552,145,670.34/643,158.85
  6. Step 6: Final answer
    x = 492,183.46

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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.