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Finding the Fourth Proportional to 390,218.80, 585,328.20 and 342,007.60

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Solution

The fourth proportional to 390,218.80, 585,328.20 and 342,007.60 is: 513,011.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,218.80 : 585,328.20 = 342,007.60 : x
  2. Step 2: Convert to fraction form
    390,218.80/585,328.20 = 342,007.60/x
  3. Step 3: Cross multiply
    390,218.80x = 585,328.20 × 342,007.60
  4. Step 4: Simplify right side
    390,218.80x = 200,186,692,894.32
  5. Step 5: Solve for x
    x = 200,186,692,894.32/390,218.80
  6. Step 6: Final answer
    x = 513,011.40

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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.