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Finding the Fourth Proportional to 451,649.06, 621,711.07 and 390,367.09

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Solution

The fourth proportional to 451,649.06, 621,711.07 and 390,367.09 is: 537,354.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    451,649.06 : 621,711.07 = 390,367.09 : x
  2. Step 2: Convert to fraction form
    451,649.06/621,711.07 = 390,367.09/x
  3. Step 3: Cross multiply
    451,649.06x = 621,711.07 × 390,367.09
  4. Step 4: Simplify right side
    451,649.06x = 242,695,538,686.49
  5. Step 5: Solve for x
    x = 242,695,538,686.49/451,649.06
  6. Step 6: Final answer
    x = 537,354.25

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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.