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Finding the Fourth Proportional to 618,434.76, 855,157.86 and 490,888.92

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Solution

The fourth proportional to 618,434.76, 855,157.86 and 490,888.92 is: 678,790.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    618,434.76 : 855,157.86 = 490,888.92 : x
  2. Step 2: Convert to fraction form
    618,434.76/855,157.86 = 490,888.92/x
  3. Step 3: Cross multiply
    618,434.76x = 855,157.86 × 490,888.92
  4. Step 4: Simplify right side
    618,434.76x = 419,787,518,324.91
  5. Step 5: Solve for x
    x = 419,787,518,324.91/618,434.76
  6. Step 6: Final answer
    x = 678,790.30

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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.