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Finding the Fourth Proportional to 390,858.12, 539,338.88 and 218,785.72

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Solution

The fourth proportional to 390,858.12, 539,338.88 and 218,785.72 is: 301,898.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,858.12 : 539,338.88 = 218,785.72 : x
  2. Step 2: Convert to fraction form
    390,858.12/539,338.88 = 218,785.72/x
  3. Step 3: Cross multiply
    390,858.12x = 539,338.88 × 218,785.72
  4. Step 4: Simplify right side
    390,858.12x = 117,999,645,184.79
  5. Step 5: Solve for x
    x = 117,999,645,184.79/390,858.12
  6. Step 6: Final answer
    x = 301,898.92

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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.