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Finding the Fourth Proportional to 390,031.20, 585,046.80 and 366,411.60

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Solution

The fourth proportional to 390,031.20, 585,046.80 and 366,411.60 is: 549,617.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,031.20 : 585,046.80 = 366,411.60 : x
  2. Step 2: Convert to fraction form
    390,031.20/585,046.80 = 366,411.60/x
  3. Step 3: Cross multiply
    390,031.20x = 585,046.80 × 366,411.60
  4. Step 4: Simplify right side
    390,031.20x = 214,367,934,062.88
  5. Step 5: Solve for x
    x = 214,367,934,062.88/390,031.20
  6. Step 6: Final answer
    x = 549,617.40

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1.5x scale

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.