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Finding the Fourth Proportional to 615,321.40, 921,426.90 and 490,905.40

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Solution

The fourth proportional to 615,321.40, 921,426.90 and 490,905.40 is: 735,117.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,321.40 : 921,426.90 = 490,905.40 : x
  2. Step 2: Convert to fraction form
    615,321.40/921,426.90 = 490,905.40/x
  3. Step 3: Cross multiply
    615,321.40x = 921,426.90 × 490,905.40
  4. Step 4: Simplify right side
    615,321.40x = 452,333,440,915.26
  5. Step 5: Solve for x
    x = 452,333,440,915.26/615,321.40
  6. Step 6: Final answer
    x = 735,117.36

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1.5x scale

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.