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Finding the Fourth Proportional to 640,328.90, 883,687.89 and 368,438.10

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Solution

The fourth proportional to 640,328.90, 883,687.89 and 368,438.10 is: 508,464.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,328.90 : 883,687.89 = 368,438.10 : x
  2. Step 2: Convert to fraction form
    640,328.90/883,687.89 = 368,438.10/x
  3. Step 3: Cross multiply
    640,328.90x = 883,687.89 × 368,438.10
  4. Step 4: Simplify right side
    640,328.90x = 325,584,287,184.61
  5. Step 5: Solve for x
    x = 325,584,287,184.61/640,328.90
  6. Step 6: Final answer
    x = 508,464.15

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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.