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Finding the Fourth Proportional to 491,510.88, 678,149.28 and 276,638.40

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Solution

The fourth proportional to 491,510.88, 678,149.28 and 276,638.40 is: 381,684.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,510.88 : 678,149.28 = 276,638.40 : x
  2. Step 2: Convert to fraction form
    491,510.88/678,149.28 = 276,638.40/x
  3. Step 3: Cross multiply
    491,510.88x = 678,149.28 × 276,638.40
  4. Step 4: Simplify right side
    491,510.88x = 187,602,131,780.35
  5. Step 5: Solve for x
    x = 187,602,131,780.35/491,510.88
  6. Step 6: Final answer
    x = 381,684.60

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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.