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Finding the Fourth Proportional to 671,931.72, 927,228.06 and 385,425

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Solution

The fourth proportional to 671,931.72, 927,228.06 and 385,425 is: 531,864.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    671,931.72 : 927,228.06 = 385,425 : x
  2. Step 2: Convert to fraction form
    671,931.72/927,228.06 = 385,425/x
  3. Step 3: Cross multiply
    671,931.72x = 927,228.06 × 385,425
  4. Step 4: Simplify right side
    671,931.72x = 357,376,875,025.50
  5. Step 5: Solve for x
    x = 357,376,875,025.50/671,931.72
  6. Step 6: Final answer
    x = 531,864.87

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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.