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Finding the Fourth Proportional to 1,247,358.78, 1,721,226.57 and 920,845.45

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Solution

The fourth proportional to 1,247,358.78, 1,721,226.57 and 920,845.45 is: 1,270,671.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247,358.78 : 1,721,226.57 = 920,845.45 : x
  2. Step 2: Convert to fraction form
    1,247,358.78/1,721,226.57 = 920,845.45/x
  3. Step 3: Cross multiply
    1,247,358.78x = 1,721,226.57 × 920,845.45
  4. Step 4: Simplify right side
    1,247,358.78x = 1,584,983,655,403.61
  5. Step 5: Solve for x
    x = 1,584,983,655,403.61/1,247,358.78
  6. Step 6: Final answer
    x = 1,270,671.82

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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.