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Finding the Fourth Proportional to 687,449.79, 948,794.72 and 400,969.86

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Solution

The fourth proportional to 687,449.79, 948,794.72 and 400,969.86 is: 553,404.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,449.79 : 948,794.72 = 400,969.86 : x
  2. Step 2: Convert to fraction form
    687,449.79/948,794.72 = 400,969.86/x
  3. Step 3: Cross multiply
    687,449.79x = 948,794.72 × 400,969.86
  4. Step 4: Simplify right side
    687,449.79x = 380,438,084,042.29
  5. Step 5: Solve for x
    x = 380,438,084,042.29/687,449.79
  6. Step 6: Final answer
    x = 553,404.90

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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.