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Finding the Fourth Proportional to 390,587.13, 585,277.79 and 263,730.20

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Solution

The fourth proportional to 390,587.13, 585,277.79 and 263,730.20 is: 395,188.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,587.13 : 585,277.79 = 263,730.20 : x
  2. Step 2: Convert to fraction form
    390,587.13/585,277.79 = 263,730.20/x
  3. Step 3: Cross multiply
    390,587.13x = 585,277.79 × 263,730.20
  4. Step 4: Simplify right side
    390,587.13x = 154,355,424,367.22
  5. Step 5: Solve for x
    x = 154,355,424,367.22/390,587.13
  6. Step 6: Final answer
    x = 395,188.20

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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.