Home / 678,492.80-1,017,739.20-644,278.40

Finding the Fourth Proportional to 678,492.80, 1,017,739.20 and 644,278.40

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Solution

The fourth proportional to 678,492.80, 1,017,739.20 and 644,278.40 is: 966,417.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,492.80 : 1,017,739.20 = 644,278.40 : x
  2. Step 2: Convert to fraction form
    678,492.80/1,017,739.20 = 644,278.40/x
  3. Step 3: Cross multiply
    678,492.80x = 1,017,739.20 × 644,278.40
  4. Step 4: Simplify right side
    678,492.80x = 655,707,383,393.28
  5. Step 5: Solve for x
    x = 655,707,383,393.28/678,492.80
  6. Step 6: Final answer
    x = 966,417.60

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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.