Home / 686,085.60-1,029,128.40-212,818.80

Finding the Fourth Proportional to 686,085.60, 1,029,128.40 and 212,818.80

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Solution

The fourth proportional to 686,085.60, 1,029,128.40 and 212,818.80 is: 319,228.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,085.60 : 1,029,128.40 = 212,818.80 : x
  2. Step 2: Convert to fraction form
    686,085.60/1,029,128.40 = 212,818.80/x
  3. Step 3: Cross multiply
    686,085.60x = 1,029,128.40 × 212,818.80
  4. Step 4: Simplify right side
    686,085.60x = 219,017,871,133.92
  5. Step 5: Solve for x
    x = 219,017,871,133.92/686,085.60
  6. Step 6: Final answer
    x = 319,228.20

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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.