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Finding the Fourth Proportional to 640,419.48, 883,653.30 and 385,784.64

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Solution

The fourth proportional to 640,419.48, 883,653.30 and 385,784.64 is: 532,307.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,419.48 : 883,653.30 = 385,784.64 : x
  2. Step 2: Convert to fraction form
    640,419.48/883,653.30 = 385,784.64/x
  3. Step 3: Cross multiply
    640,419.48x = 883,653.30 × 385,784.64
  4. Step 4: Simplify right side
    640,419.48x = 340,899,870,225.31
  5. Step 5: Solve for x
    x = 340,899,870,225.31/640,419.48
  6. Step 6: Final answer
    x = 532,307.15

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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.