Home / 687,711.80-1,031,567.70-421,772.60

Finding the Fourth Proportional to 687,711.80, 1,031,567.70 and 421,772.60

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Solution

The fourth proportional to 687,711.80, 1,031,567.70 and 421,772.60 is: 632,658.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,711.80 : 1,031,567.70 = 421,772.60 : x
  2. Step 2: Convert to fraction form
    687,711.80/1,031,567.70 = 421,772.60/x
  3. Step 3: Cross multiply
    687,711.80x = 1,031,567.70 × 421,772.60
  4. Step 4: Simplify right side
    687,711.80x = 435,086,990,905.02
  5. Step 5: Solve for x
    x = 435,086,990,905.02/687,711.80
  6. Step 6: Final answer
    x = 632,658.90

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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.