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Finding the Fourth Proportional to 1,138,974.80, 1,708,721.40 and 665,416.40

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Solution

The fourth proportional to 1,138,974.80, 1,708,721.40 and 665,416.40 is: 998,276.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138,974.80 : 1,708,721.40 = 665,416.40 : x
  2. Step 2: Convert to fraction form
    1,138,974.80/1,708,721.40 = 665,416.40/x
  3. Step 3: Cross multiply
    1,138,974.80x = 1,708,721.40 × 665,416.40
  4. Step 4: Simplify right side
    1,138,974.80x = 1,137,011,242,590.96
  5. Step 5: Solve for x
    x = 1,137,011,242,590.96/1,138,974.80
  6. Step 6: Final answer
    x = 998,276.03

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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.