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Finding the Fourth Proportional to 390,423.39, 538,781.22 and 218,341.62

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Solution

The fourth proportional to 390,423.39, 538,781.22 and 218,341.62 is: 301,309.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,423.39 : 538,781.22 = 218,341.62 : x
  2. Step 2: Convert to fraction form
    390,423.39/538,781.22 = 218,341.62/x
  3. Step 3: Cross multiply
    390,423.39x = 538,781.22 × 218,341.62
  4. Step 4: Simplify right side
    390,423.39x = 117,638,364,400.38
  5. Step 5: Solve for x
    x = 117,638,364,400.38/390,423.39
  6. Step 6: Final answer
    x = 301,309.73

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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.