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Finding the Fourth Proportional to 1,005,129, 1,387,078.02 and 552,420

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Solution

The fourth proportional to 1,005,129, 1,387,078.02 and 552,420 is: 762,339.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005,129 : 1,387,078.02 = 552,420 : x
  2. Step 2: Convert to fraction form
    1,005,129/1,387,078.02 = 552,420/x
  3. Step 3: Cross multiply
    1,005,129x = 1,387,078.02 × 552,420
  4. Step 4: Simplify right side
    1,005,129x = 766,249,639,808.40
  5. Step 5: Solve for x
    x = 766,249,639,808.40/1,005,129
  6. Step 6: Final answer
    x = 762,339.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.