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Finding the Fourth Proportional to 390,072.60, 585,108.90 and 322,421.40

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Solution

The fourth proportional to 390,072.60, 585,108.90 and 322,421.40 is: 483,632.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,072.60 : 585,108.90 = 322,421.40 : x
  2. Step 2: Convert to fraction form
    390,072.60/585,108.90 = 322,421.40/x
  3. Step 3: Cross multiply
    390,072.60x = 585,108.90 × 322,421.40
  4. Step 4: Simplify right side
    390,072.60x = 188,651,630,690.46
  5. Step 5: Solve for x
    x = 188,651,630,690.46/390,072.60
  6. Step 6: Final answer
    x = 483,632.10

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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.