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Finding the Fourth Proportional to 1,405,345.04, 1,939,605.80 and 861,780

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Solution

The fourth proportional to 1,405,345.04, 1,939,605.80 and 861,780 is: 1,189,397.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405,345.04 : 1,939,605.80 = 861,780 : x
  2. Step 2: Convert to fraction form
    1,405,345.04/1,939,605.80 = 861,780/x
  3. Step 3: Cross multiply
    1,405,345.04x = 1,939,605.80 × 861,780
  4. Step 4: Simplify right side
    1,405,345.04x = 1,671,513,486,324
  5. Step 5: Solve for x
    x = 1,671,513,486,324/1,405,345.04
  6. Step 6: Final answer
    x = 1,189,397.22

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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.