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Finding the Fourth Proportional to 389,995, 537,672.64 and 309,688.36

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Solution

The fourth proportional to 389,995, 537,672.64 and 309,688.36 is: 426,956.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,995 : 537,672.64 = 309,688.36 : x
  2. Step 2: Convert to fraction form
    389,995/537,672.64 = 309,688.36/x
  3. Step 3: Cross multiply
    389,995x = 537,672.64 × 309,688.36
  4. Step 4: Simplify right side
    389,995x = 166,510,958,098.47
  5. Step 5: Solve for x
    x = 166,510,958,098.47/389,995
  6. Step 6: Final answer
    x = 426,956.65

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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.