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Finding the Fourth Proportional to 451,648.31, 621,710.03 and 390,366.34

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Solution

The fourth proportional to 451,648.31, 621,710.03 and 390,366.34 is: 537,353.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    451,648.31 : 621,710.03 = 390,366.34 : x
  2. Step 2: Convert to fraction form
    451,648.31/621,710.03 = 390,366.34/x
  3. Step 3: Cross multiply
    451,648.31x = 621,710.03 × 390,366.34
  4. Step 4: Simplify right side
    451,648.31x = 242,694,668,374.03
  5. Step 5: Solve for x
    x = 242,694,668,374.03/451,648.31
  6. Step 6: Final answer
    x = 537,353.21

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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.