Home / 686,078.10-1,029,117.15-212,811.30

Finding the Fourth Proportional to 686,078.10, 1,029,117.15 and 212,811.30

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Solution

The fourth proportional to 686,078.10, 1,029,117.15 and 212,811.30 is: 319,216.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,078.10 : 1,029,117.15 = 212,811.30 : x
  2. Step 2: Convert to fraction form
    686,078.10/1,029,117.15 = 212,811.30/x
  3. Step 3: Cross multiply
    686,078.10x = 1,029,117.15 × 212,811.30
  4. Step 4: Simplify right side
    686,078.10x = 219,007,758,543.80
  5. Step 5: Solve for x
    x = 219,007,758,543.80/686,078.10
  6. Step 6: Final answer
    x = 319,216.95

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Double scale
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Similar ratio
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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.