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Finding the Fourth Proportional to 1,216,642.80, 1,678,977.93 and 672,815.18

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Solution

The fourth proportional to 1,216,642.80, 1,678,977.93 and 672,815.18 is: 928,490.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216,642.80 : 1,678,977.93 = 672,815.18 : x
  2. Step 2: Convert to fraction form
    1,216,642.80/1,678,977.93 = 672,815.18/x
  3. Step 3: Cross multiply
    1,216,642.80x = 1,678,977.93 × 672,815.18
  4. Step 4: Simplify right side
    1,216,642.80x = 1,129,641,838,188.98
  5. Step 5: Solve for x
    x = 1,129,641,838,188.98/1,216,642.80
  6. Step 6: Final answer
    x = 928,490.96

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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.