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Finding the Fourth Proportional to 390,351.96, 538,674.12 and 218,259.36

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Solution

The fourth proportional to 390,351.96, 538,674.12 and 218,259.36 is: 301,191.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,351.96 : 538,674.12 = 218,259.36 : x
  2. Step 2: Convert to fraction form
    390,351.96/538,674.12 = 218,259.36/x
  3. Step 3: Cross multiply
    390,351.96x = 538,674.12 × 218,259.36
  4. Step 4: Simplify right side
    390,351.96x = 117,570,668,679.76
  5. Step 5: Solve for x
    x = 117,570,668,679.76/390,351.96
  6. Step 6: Final answer
    x = 301,191.44

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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.