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Finding the Fourth Proportional to 468,005.40, 645,261.78 and 390,592.79

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Solution

The fourth proportional to 468,005.40, 645,261.78 and 390,592.79 is: 538,529.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    468,005.40 : 645,261.78 = 390,592.79 : x
  2. Step 2: Convert to fraction form
    468,005.40/645,261.78 = 390,592.79/x
  3. Step 3: Cross multiply
    468,005.40x = 645,261.78 × 390,592.79
  4. Step 4: Simplify right side
    468,005.40x = 252,034,595,704.26
  5. Step 5: Solve for x
    x = 252,034,595,704.26/468,005.40
  6. Step 6: Final answer
    x = 538,529.25

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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.