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Finding the Fourth Proportional to 643,887.20, 964,518.60 and 328,521.80

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Solution

The fourth proportional to 643,887.20, 964,518.60 and 328,521.80 is: 492,113.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,887.20 : 964,518.60 = 328,521.80 : x
  2. Step 2: Convert to fraction form
    643,887.20/964,518.60 = 328,521.80/x
  3. Step 3: Cross multiply
    643,887.20x = 964,518.60 × 328,521.80
  4. Step 4: Simplify right side
    643,887.20x = 316,865,386,605.48
  5. Step 5: Solve for x
    x = 316,865,386,605.48/643,887.20
  6. Step 6: Final answer
    x = 492,113.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.