Home / 689,135.40-1,031,661.90-512,425.80

Finding the Fourth Proportional to 689,135.40, 1,031,661.90 and 512,425.80

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Solution

The fourth proportional to 689,135.40, 1,031,661.90 and 512,425.80 is: 767,120.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,135.40 : 1,031,661.90 = 512,425.80 : x
  2. Step 2: Convert to fraction form
    689,135.40/1,031,661.90 = 512,425.80/x
  3. Step 3: Cross multiply
    689,135.40x = 1,031,661.90 × 512,425.80
  4. Step 4: Simplify right side
    689,135.40x = 528,650,174,437.02
  5. Step 5: Solve for x
    x = 528,650,174,437.02/689,135.40
  6. Step 6: Final answer
    x = 767,120.91

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Double scale
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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.