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Finding the Fourth Proportional to 423,043.20, 634,564.80 and 393,518.70

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Solution

The fourth proportional to 423,043.20, 634,564.80 and 393,518.70 is: 590,278.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,043.20 : 634,564.80 = 393,518.70 : x
  2. Step 2: Convert to fraction form
    423,043.20/634,564.80 = 393,518.70/x
  3. Step 3: Cross multiply
    423,043.20x = 634,564.80 × 393,518.70
  4. Step 4: Simplify right side
    423,043.20x = 249,713,115,161.76
  5. Step 5: Solve for x
    x = 249,713,115,161.76/423,043.20
  6. Step 6: Final answer
    x = 590,278.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.