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Finding the Fourth Proportional to 1,312,785.78, 1,811,646 and 709,173.78

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Solution

The fourth proportional to 1,312,785.78, 1,811,646 and 709,173.78 is: 978,660.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312,785.78 : 1,811,646 = 709,173.78 : x
  2. Step 2: Convert to fraction form
    1,312,785.78/1,811,646 = 709,173.78/x
  3. Step 3: Cross multiply
    1,312,785.78x = 1,811,646 × 709,173.78
  4. Step 4: Simplify right side
    1,312,785.78x = 1,284,771,841,841.88
  5. Step 5: Solve for x
    x = 1,284,771,841,841.88/1,312,785.78
  6. Step 6: Final answer
    x = 978,660.69

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1.5x scale

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.