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Finding the Fourth Proportional to 640,916.40, 961,374.60 and 640,916.40

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Solution

The fourth proportional to 640,916.40, 961,374.60 and 640,916.40 is: 961,374.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,916.40 : 961,374.60 = 640,916.40 : x
  2. Step 2: Convert to fraction form
    640,916.40/961,374.60 = 640,916.40/x
  3. Step 3: Cross multiply
    640,916.40x = 961,374.60 × 640,916.40
  4. Step 4: Simplify right side
    640,916.40x = 616,160,747,683.44
  5. Step 5: Solve for x
    x = 616,160,747,683.44/640,916.40
  6. Step 6: Final answer
    x = 961,374.60

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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.