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Finding the Fourth Proportional to 993,910.80, 1,490,866.20 and 678,982.80

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Solution

The fourth proportional to 993,910.80, 1,490,866.20 and 678,982.80 is: 1,018,474.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    993,910.80 : 1,490,866.20 = 678,982.80 : x
  2. Step 2: Convert to fraction form
    993,910.80/1,490,866.20 = 678,982.80/x
  3. Step 3: Cross multiply
    993,910.80x = 1,490,866.20 × 678,982.80
  4. Step 4: Simplify right side
    993,910.80x = 1,012,272,506,901.36
  5. Step 5: Solve for x
    x = 1,012,272,506,901.36/993,910.80
  6. Step 6: Final answer
    x = 1,018,474.20

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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.