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Finding the Fourth Proportional to 661,420.70, 912,734.12 and 389,500.05

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Solution

The fourth proportional to 661,420.70, 912,734.12 and 389,500.05 is: 537,494.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,420.70 : 912,734.12 = 389,500.05 : x
  2. Step 2: Convert to fraction form
    661,420.70/912,734.12 = 389,500.05/x
  3. Step 3: Cross multiply
    661,420.70x = 912,734.12 × 389,500.05
  4. Step 4: Simplify right side
    661,420.70x = 355,509,983,429.21
  5. Step 5: Solve for x
    x = 355,509,983,429.21/661,420.70
  6. Step 6: Final answer
    x = 537,494.50

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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.