Home / 687,139.20-1,031,486.40-406,814.40

Finding the Fourth Proportional to 687,139.20, 1,031,486.40 and 406,814.40

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Solution

The fourth proportional to 687,139.20, 1,031,486.40 and 406,814.40 is: 610,681.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,139.20 : 1,031,486.40 = 406,814.40 : x
  2. Step 2: Convert to fraction form
    687,139.20/1,031,486.40 = 406,814.40/x
  3. Step 3: Cross multiply
    687,139.20x = 1,031,486.40 × 406,814.40
  4. Step 4: Simplify right side
    687,139.20x = 419,623,520,924.16
  5. Step 5: Solve for x
    x = 419,623,520,924.16/687,139.20
  6. Step 6: Final answer
    x = 610,681.97

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1.5x scale

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.