Home / 390,928.85-539,532.63-218,912.31

Finding the Fourth Proportional to 390,928.85, 539,532.63 and 218,912.31

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Solution

The fourth proportional to 390,928.85, 539,532.63 and 218,912.31 is: 302,127.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,928.85 : 539,532.63 = 218,912.31 : x
  2. Step 2: Convert to fraction form
    390,928.85/539,532.63 = 218,912.31/x
  3. Step 3: Cross multiply
    390,928.85x = 539,532.63 × 218,912.31
  4. Step 4: Simplify right side
    390,928.85x = 118,110,334,353.68
  5. Step 5: Solve for x
    x = 118,110,334,353.68/390,928.85
  6. Step 6: Final answer
    x = 302,127.45

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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.