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Finding the Fourth Proportional to 438,730.20, 656,783.10 and 261,145.80

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Solution

The fourth proportional to 438,730.20, 656,783.10 and 261,145.80 is: 390,937.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,730.20 : 656,783.10 = 261,145.80 : x
  2. Step 2: Convert to fraction form
    438,730.20/656,783.10 = 261,145.80/x
  3. Step 3: Cross multiply
    438,730.20x = 656,783.10 × 261,145.80
  4. Step 4: Simplify right side
    438,730.20x = 171,516,148,075.98
  5. Step 5: Solve for x
    x = 171,516,148,075.98/438,730.20
  6. Step 6: Final answer
    x = 390,937.64

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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.