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Finding the Fourth Proportional to 643,228.16, 887,709.36 and 356,840.50

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Solution

The fourth proportional to 643,228.16, 887,709.36 and 356,840.50 is: 492,470.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,228.16 : 887,709.36 = 356,840.50 : x
  2. Step 2: Convert to fraction form
    643,228.16/887,709.36 = 356,840.50/x
  3. Step 3: Cross multiply
    643,228.16x = 887,709.36 × 356,840.50
  4. Step 4: Simplify right side
    643,228.16x = 316,770,651,877.08
  5. Step 5: Solve for x
    x = 316,770,651,877.08/643,228.16
  6. Step 6: Final answer
    x = 492,470.12

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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.