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Finding the Fourth Proportional to 390,608.70, 538,815.78 and 229,434.10

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Solution

The fourth proportional to 390,608.70, 538,815.78 and 229,434.10 is: 316,487.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,608.70 : 538,815.78 = 229,434.10 : x
  2. Step 2: Convert to fraction form
    390,608.70/538,815.78 = 229,434.10/x
  3. Step 3: Cross multiply
    390,608.70x = 538,815.78 × 229,434.10
  4. Step 4: Simplify right side
    390,608.70x = 123,622,713,550.10
  5. Step 5: Solve for x
    x = 123,622,713,550.10/390,608.70
  6. Step 6: Final answer
    x = 316,487.35

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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.