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Finding the Fourth Proportional to 817,855.85, 1,128,660.85 and 455,304.21

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Solution

The fourth proportional to 817,855.85, 1,128,660.85 and 455,304.21 is: 628,330.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    817,855.85 : 1,128,660.85 = 455,304.21 : x
  2. Step 2: Convert to fraction form
    817,855.85/1,128,660.85 = 455,304.21/x
  3. Step 3: Cross multiply
    817,855.85x = 1,128,660.85 × 455,304.21
  4. Step 4: Simplify right side
    817,855.85x = 513,884,041,468.79
  5. Step 5: Solve for x
    x = 513,884,041,468.79/817,855.85
  6. Step 6: Final answer
    x = 628,330.83

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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.