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Finding the Fourth Proportional to 615,623.40, 921,879.90 and 491,207.40

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Solution

The fourth proportional to 615,623.40, 921,879.90 and 491,207.40 is: 735,570.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,623.40 : 921,879.90 = 491,207.40 : x
  2. Step 2: Convert to fraction form
    615,623.40/921,879.90 = 491,207.40/x
  3. Step 3: Cross multiply
    615,623.40x = 921,879.90 × 491,207.40
  4. Step 4: Simplify right side
    615,623.40x = 452,834,228,791.26
  5. Step 5: Solve for x
    x = 452,834,228,791.26/615,623.40
  6. Step 6: Final answer
    x = 735,570.20

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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.