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Finding the Fourth Proportional to 487,130.60, 729,918.30 and 407,815.40

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Solution

The fourth proportional to 487,130.60, 729,918.30 and 407,815.40 is: 611,072.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,130.60 : 729,918.30 = 407,815.40 : x
  2. Step 2: Convert to fraction form
    487,130.60/729,918.30 = 407,815.40/x
  3. Step 3: Cross multiply
    487,130.60x = 729,918.30 × 407,815.40
  4. Step 4: Simplify right side
    487,130.60x = 297,671,923,481.82
  5. Step 5: Solve for x
    x = 297,671,923,481.82/487,130.60
  6. Step 6: Final answer
    x = 611,072.11

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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.