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Finding the Fourth Proportional to 390,315.43, 538,338.11 and 335,960.11

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Solution

The fourth proportional to 390,315.43, 538,338.11 and 335,960.11 is: 463,369.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,315.43 : 538,338.11 = 335,960.11 : x
  2. Step 2: Convert to fraction form
    390,315.43/538,338.11 = 335,960.11/x
  3. Step 3: Cross multiply
    390,315.43x = 538,338.11 × 335,960.11
  4. Step 4: Simplify right side
    390,315.43x = 180,860,130,652.79
  5. Step 5: Solve for x
    x = 180,860,130,652.79/390,315.43
  6. Step 6: Final answer
    x = 463,369.15

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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.