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Finding the Fourth Proportional to 390,278.66, 585,639.42 and 153,787.41

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Solution

The fourth proportional to 390,278.66, 585,639.42 and 153,787.41 is: 230,768.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,278.66 : 585,639.42 = 153,787.41 : x
  2. Step 2: Convert to fraction form
    390,278.66/585,639.42 = 153,787.41/x
  3. Step 3: Cross multiply
    390,278.66x = 585,639.42 × 153,787.41
  4. Step 4: Simplify right side
    390,278.66x = 90,063,969,595.70
  5. Step 5: Solve for x
    x = 90,063,969,595.70/390,278.66
  6. Step 6: Final answer
    x = 230,768.37

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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.