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Finding the Fourth Proportional to 615,139.40, 921,672.30 and 298,915.40

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Solution

The fourth proportional to 615,139.40, 921,672.30 and 298,915.40 is: 447,869.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,139.40 : 921,672.30 = 298,915.40 : x
  2. Step 2: Convert to fraction form
    615,139.40/921,672.30 = 298,915.40/x
  3. Step 3: Cross multiply
    615,139.40x = 921,672.30 × 298,915.40
  4. Step 4: Simplify right side
    615,139.40x = 275,502,044,223.42
  5. Step 5: Solve for x
    x = 275,502,044,223.42/615,139.40
  6. Step 6: Final answer
    x = 447,869.29

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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.