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Finding the Fourth Proportional to 390,078.10, 585,117.15 and 360,918.10

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Solution

The fourth proportional to 390,078.10, 585,117.15 and 360,918.10 is: 541,377.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,078.10 : 585,117.15 = 360,918.10 : x
  2. Step 2: Convert to fraction form
    390,078.10/585,117.15 = 360,918.10/x
  3. Step 3: Cross multiply
    390,078.10x = 585,117.15 × 360,918.10
  4. Step 4: Simplify right side
    390,078.10x = 211,179,370,055.42
  5. Step 5: Solve for x
    x = 211,179,370,055.42/390,078.10
  6. Step 6: Final answer
    x = 541,377.15

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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.