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Finding the Fourth Proportional to 687,445.78, 948,685.42 and 381,541.88

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Solution

The fourth proportional to 687,445.78, 948,685.42 and 381,541.88 is: 526,533.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,445.78 : 948,685.42 = 381,541.88 : x
  2. Step 2: Convert to fraction form
    687,445.78/948,685.42 = 381,541.88/x
  3. Step 3: Cross multiply
    687,445.78x = 948,685.42 × 381,541.88
  4. Step 4: Simplify right side
    687,445.78x = 361,963,218,675.39
  5. Step 5: Solve for x
    x = 361,963,218,675.39/687,445.78
  6. Step 6: Final answer
    x = 526,533.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.