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Finding the Fourth Proportional to 640,941.80, 961,412.70 and 266,916.20

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Solution

The fourth proportional to 640,941.80, 961,412.70 and 266,916.20 is: 400,374.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,941.80 : 961,412.70 = 266,916.20 : x
  2. Step 2: Convert to fraction form
    640,941.80/961,412.70 = 266,916.20/x
  3. Step 3: Cross multiply
    640,941.80x = 961,412.70 × 266,916.20
  4. Step 4: Simplify right side
    640,941.80x = 256,616,624,515.74
  5. Step 5: Solve for x
    x = 256,616,624,515.74/640,941.80
  6. Step 6: Final answer
    x = 400,374.30

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Double scale
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Similar ratio
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1.5x scale

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.