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Finding the Fourth Proportional to 390,856.74, 539,336.98 and 218,784.34

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Solution

The fourth proportional to 390,856.74, 539,336.98 and 218,784.34 is: 301,897.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,856.74 : 539,336.98 = 218,784.34 : x
  2. Step 2: Convert to fraction form
    390,856.74/539,336.98 = 218,784.34/x
  3. Step 3: Cross multiply
    390,856.74x = 539,336.98 × 218,784.34
  4. Step 4: Simplify right side
    390,856.74x = 117,998,486,154.55
  5. Step 5: Solve for x
    x = 117,998,486,154.55/390,856.74
  6. Step 6: Final answer
    x = 301,897.02

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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.