Home / 718,756.10-991,890.34-396,479.78

Finding the Fourth Proportional to 718,756.10, 991,890.34 and 396,479.78

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Solution

The fourth proportional to 718,756.10, 991,890.34 and 396,479.78 is: 547,145.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,756.10 : 991,890.34 = 396,479.78 : x
  2. Step 2: Convert to fraction form
    718,756.10/991,890.34 = 396,479.78/x
  3. Step 3: Cross multiply
    718,756.10x = 991,890.34 × 396,479.78
  4. Step 4: Simplify right side
    718,756.10x = 393,264,463,787.33
  5. Step 5: Solve for x
    x = 393,264,463,787.33/718,756.10
  6. Step 6: Final answer
    x = 547,145.91

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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.