Home / 815,814.60-1,223,721.90-515,320.80

Finding the Fourth Proportional to 815,814.60, 1,223,721.90 and 515,320.80

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Solution

The fourth proportional to 815,814.60, 1,223,721.90 and 515,320.80 is: 772,981.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,814.60 : 1,223,721.90 = 515,320.80 : x
  2. Step 2: Convert to fraction form
    815,814.60/1,223,721.90 = 515,320.80/x
  3. Step 3: Cross multiply
    815,814.60x = 1,223,721.90 × 515,320.80
  4. Step 4: Simplify right side
    815,814.60x = 630,609,348,485.52
  5. Step 5: Solve for x
    x = 630,609,348,485.52/815,814.60
  6. Step 6: Final answer
    x = 772,981.20

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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.