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Finding the Fourth Proportional to 866,963.71, 1,300,455.13 and 387,215.87

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Solution

The fourth proportional to 866,963.71, 1,300,455.13 and 387,215.87 is: 580,828.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    866,963.71 : 1,300,455.13 = 387,215.87 : x
  2. Step 2: Convert to fraction form
    866,963.71/1,300,455.13 = 387,215.87/x
  3. Step 3: Cross multiply
    866,963.71x = 1,300,455.13 × 387,215.87
  4. Step 4: Simplify right side
    866,963.71x = 503,556,860,383.11
  5. Step 5: Solve for x
    x = 503,556,860,383.11/866,963.71
  6. Step 6: Final answer
    x = 580,828.08

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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.