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Finding the Fourth Proportional to 515,428.40, 771,830.40 and 491,808.80

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Solution

The fourth proportional to 515,428.40, 771,830.40 and 491,808.80 is: 736,461.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,428.40 : 771,830.40 = 491,808.80 : x
  2. Step 2: Convert to fraction form
    515,428.40/771,830.40 = 491,808.80/x
  3. Step 3: Cross multiply
    515,428.40x = 771,830.40 × 491,808.80
  4. Step 4: Simplify right side
    515,428.40x = 379,592,982,827.52
  5. Step 5: Solve for x
    x = 379,592,982,827.52/515,428.40
  6. Step 6: Final answer
    x = 736,461.13

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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.