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Finding the Fourth Proportional to 390,479.40, 585,719.64 and 120,613.32

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Solution

The fourth proportional to 390,479.40, 585,719.64 and 120,613.32 is: 180,920.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,479.40 : 585,719.64 = 120,613.32 : x
  2. Step 2: Convert to fraction form
    390,479.40/585,719.64 = 120,613.32/x
  3. Step 3: Cross multiply
    390,479.40x = 585,719.64 × 120,613.32
  4. Step 4: Simplify right side
    390,479.40x = 70,645,590,369.60
  5. Step 5: Solve for x
    x = 70,645,590,369.60/390,479.40
  6. Step 6: Final answer
    x = 180,920.15

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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.