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Finding the Fourth Proportional to 640,330.40, 883,689.96 and 368,439.60

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Solution

The fourth proportional to 640,330.40, 883,689.96 and 368,439.60 is: 508,466.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,330.40 : 883,689.96 = 368,439.60 : x
  2. Step 2: Convert to fraction form
    640,330.40/883,689.96 = 368,439.60/x
  3. Step 3: Cross multiply
    640,330.40x = 883,689.96 × 368,439.60
  4. Step 4: Simplify right side
    640,330.40x = 325,586,375,386.42
  5. Step 5: Solve for x
    x = 325,586,375,386.42/640,330.40
  6. Step 6: Final answer
    x = 508,466.22

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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.