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Finding the Fourth Proportional to 673,438.62, 929,216.70 and 386,970.78

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Solution

The fourth proportional to 673,438.62, 929,216.70 and 386,970.78 is: 533,945.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    673,438.62 : 929,216.70 = 386,970.78 : x
  2. Step 2: Convert to fraction form
    673,438.62/929,216.70 = 386,970.78/x
  3. Step 3: Cross multiply
    673,438.62x = 929,216.70 × 386,970.78
  4. Step 4: Simplify right side
    673,438.62x = 359,579,711,188.03
  5. Step 5: Solve for x
    x = 359,579,711,188.03/673,438.62
  6. Step 6: Final answer
    x = 533,945.78

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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.