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Finding the Fourth Proportional to 873,408.72, 1,205,339.40 and 486,240

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Solution

The fourth proportional to 873,408.72, 1,205,339.40 and 486,240 is: 671,030.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    873,408.72 : 1,205,339.40 = 486,240 : x
  2. Step 2: Convert to fraction form
    873,408.72/1,205,339.40 = 486,240/x
  3. Step 3: Cross multiply
    873,408.72x = 1,205,339.40 × 486,240
  4. Step 4: Simplify right side
    873,408.72x = 586,084,229,856
  5. Step 5: Solve for x
    x = 586,084,229,856/873,408.72
  6. Step 6: Final answer
    x = 671,030.89

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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.