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Finding the Fourth Proportional to 415,820.40, 623,730.60 and 389,576.40

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Solution

The fourth proportional to 415,820.40, 623,730.60 and 389,576.40 is: 584,364.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,820.40 : 623,730.60 = 389,576.40 : x
  2. Step 2: Convert to fraction form
    415,820.40/623,730.60 = 389,576.40/x
  3. Step 3: Cross multiply
    415,820.40x = 623,730.60 × 389,576.40
  4. Step 4: Simplify right side
    415,820.40x = 242,990,721,717.84
  5. Step 5: Solve for x
    x = 242,990,721,717.84/415,820.40
  6. Step 6: Final answer
    x = 584,364.60

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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.