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Finding the Fourth Proportional to 390,044.80, 585,067.20 and 311,312.80

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Solution

The fourth proportional to 390,044.80, 585,067.20 and 311,312.80 is: 466,969.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,044.80 : 585,067.20 = 311,312.80 : x
  2. Step 2: Convert to fraction form
    390,044.80/585,067.20 = 311,312.80/x
  3. Step 3: Cross multiply
    390,044.80x = 585,067.20 × 311,312.80
  4. Step 4: Simplify right side
    390,044.80x = 182,138,908,220.16
  5. Step 5: Solve for x
    x = 182,138,908,220.16/390,044.80
  6. Step 6: Final answer
    x = 466,969.20

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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.