Home / 687,738.60-1,031,607.90-214,420.20

Finding the Fourth Proportional to 687,738.60, 1,031,607.90 and 214,420.20

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Solution

The fourth proportional to 687,738.60, 1,031,607.90 and 214,420.20 is: 321,630.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,738.60 : 1,031,607.90 = 214,420.20 : x
  2. Step 2: Convert to fraction form
    687,738.60/1,031,607.90 = 214,420.20/x
  3. Step 3: Cross multiply
    687,738.60x = 1,031,607.90 × 214,420.20
  4. Step 4: Simplify right side
    687,738.60x = 221,197,572,239.58
  5. Step 5: Solve for x
    x = 221,197,572,239.58/687,738.60
  6. Step 6: Final answer
    x = 321,630.30

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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.