Home / 876,346.45-1,209,353.65-489,139.72

Finding the Fourth Proportional to 876,346.45, 1,209,353.65 and 489,139.72

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Solution

The fourth proportional to 876,346.45, 1,209,353.65 and 489,139.72 is: 675,010.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    876,346.45 : 1,209,353.65 = 489,139.72 : x
  2. Step 2: Convert to fraction form
    876,346.45/1,209,353.65 = 489,139.72/x
  3. Step 3: Cross multiply
    876,346.45x = 1,209,353.65 × 489,139.72
  4. Step 4: Simplify right side
    876,346.45x = 591,542,901,495.75
  5. Step 5: Solve for x
    x = 591,542,901,495.75/876,346.45
  6. Step 6: Final answer
    x = 675,010.33

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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.