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Finding the Fourth Proportional to 640,727.40, 961,091.10 and 640,727.40

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Solution

The fourth proportional to 640,727.40, 961,091.10 and 640,727.40 is: 961,091.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,727.40 : 961,091.10 = 640,727.40 : x
  2. Step 2: Convert to fraction form
    640,727.40/961,091.10 = 640,727.40/x
  3. Step 3: Cross multiply
    640,727.40x = 961,091.10 × 640,727.40
  4. Step 4: Simplify right side
    640,727.40x = 615,797,401,666.14
  5. Step 5: Solve for x
    x = 615,797,401,666.14/640,727.40
  6. Step 6: Final answer
    x = 961,091.10

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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.