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Finding the Fourth Proportional to 709,947.54, 979,731.20 and 387,657.63

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Solution

The fourth proportional to 709,947.54, 979,731.20 and 387,657.63 is: 534,969.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,947.54 : 979,731.20 = 387,657.63 : x
  2. Step 2: Convert to fraction form
    709,947.54/979,731.20 = 387,657.63/x
  3. Step 3: Cross multiply
    709,947.54x = 979,731.20 × 387,657.63
  4. Step 4: Simplify right side
    709,947.54x = 379,800,275,029.06
  5. Step 5: Solve for x
    x = 379,800,275,029.06/709,947.54
  6. Step 6: Final answer
    x = 534,969.49

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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.