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Finding the Fourth Proportional to 640,118.88, 960,513.60 and 415,426.40

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Solution

The fourth proportional to 640,118.88, 960,513.60 and 415,426.40 is: 623,357.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,118.88 : 960,513.60 = 415,426.40 : x
  2. Step 2: Convert to fraction form
    640,118.88/960,513.60 = 415,426.40/x
  3. Step 3: Cross multiply
    640,118.88x = 960,513.60 × 415,426.40
  4. Step 4: Simplify right side
    640,118.88x = 399,022,706,999.04
  5. Step 5: Solve for x
    x = 399,022,706,999.04/640,118.88
  6. Step 6: Final answer
    x = 623,357.19

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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.