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Finding the Fourth Proportional to 491,432.79, 678,386.51 and 330,381.25

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Solution

The fourth proportional to 491,432.79, 678,386.51 and 330,381.25 is: 456,066.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,432.79 : 678,386.51 = 330,381.25 : x
  2. Step 2: Convert to fraction form
    491,432.79/678,386.51 = 330,381.25/x
  3. Step 3: Cross multiply
    491,432.79x = 678,386.51 × 330,381.25
  4. Step 4: Simplify right side
    491,432.79x = 224,126,183,156.94
  5. Step 5: Solve for x
    x = 224,126,183,156.94/491,432.79
  6. Step 6: Final answer
    x = 456,066.81

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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.