Home / 390,858.19-539,338.96-218,785.78

Finding the Fourth Proportional to 390,858.19, 539,338.96 and 218,785.78

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Solution

The fourth proportional to 390,858.19, 539,338.96 and 218,785.78 is: 301,899.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,858.19 : 539,338.96 = 218,785.78 : x
  2. Step 2: Convert to fraction form
    390,858.19/539,338.96 = 218,785.78/x
  3. Step 3: Cross multiply
    390,858.19x = 539,338.96 × 218,785.78
  4. Step 4: Simplify right side
    390,858.19x = 117,999,695,047.99
  5. Step 5: Solve for x
    x = 117,999,695,047.99/390,858.19
  6. Step 6: Final answer
    x = 301,899.00

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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.