Home / 687,812.40-1,031,864.40-208,000.80

Finding the Fourth Proportional to 687,812.40, 1,031,864.40 and 208,000.80

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Solution

The fourth proportional to 687,812.40, 1,031,864.40 and 208,000.80 is: 312,045.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,812.40 : 1,031,864.40 = 208,000.80 : x
  2. Step 2: Convert to fraction form
    687,812.40/1,031,864.40 = 208,000.80/x
  3. Step 3: Cross multiply
    687,812.40x = 1,031,864.40 × 208,000.80
  4. Step 4: Simplify right side
    687,812.40x = 214,628,620,691.52
  5. Step 5: Solve for x
    x = 214,628,620,691.52/687,812.40
  6. Step 6: Final answer
    x = 312,045.29

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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.