Home / 815,020.80-1,221,656.40-309,386.40

Finding the Fourth Proportional to 815,020.80, 1,221,656.40 and 309,386.40

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Solution

The fourth proportional to 815,020.80, 1,221,656.40 and 309,386.40 is: 463,747.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,020.80 : 1,221,656.40 = 309,386.40 : x
  2. Step 2: Convert to fraction form
    815,020.80/1,221,656.40 = 309,386.40/x
  3. Step 3: Cross multiply
    815,020.80x = 1,221,656.40 × 309,386.40
  4. Step 4: Simplify right side
    815,020.80x = 377,963,875,632.96
  5. Step 5: Solve for x
    x = 377,963,875,632.96/815,020.80
  6. Step 6: Final answer
    x = 463,747.52

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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.