Home / 390,853.16-539,331.96-218,780.72

Finding the Fourth Proportional to 390,853.16, 539,331.96 and 218,780.72

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Solution

The fourth proportional to 390,853.16, 539,331.96 and 218,780.72 is: 301,891.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,853.16 : 539,331.96 = 218,780.72 : x
  2. Step 2: Convert to fraction form
    390,853.16/539,331.96 = 218,780.72/x
  3. Step 3: Cross multiply
    390,853.16x = 539,331.96 × 218,780.72
  4. Step 4: Simplify right side
    390,853.16x = 117,995,434,527.81
  5. Step 5: Solve for x
    x = 117,995,434,527.81/390,853.16
  6. Step 6: Final answer
    x = 301,891.98

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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.