Home / 579,814.60-869,721.90-280,438.60

Finding the Fourth Proportional to 579,814.60, 869,721.90 and 280,438.60

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Solution

The fourth proportional to 579,814.60, 869,721.90 and 280,438.60 is: 420,657.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,814.60 : 869,721.90 = 280,438.60 : x
  2. Step 2: Convert to fraction form
    579,814.60/869,721.90 = 280,438.60/x
  3. Step 3: Cross multiply
    579,814.60x = 869,721.90 × 280,438.60
  4. Step 4: Simplify right side
    579,814.60x = 243,903,592,025.34
  5. Step 5: Solve for x
    x = 243,903,592,025.34/579,814.60
  6. Step 6: Final answer
    x = 420,657.90

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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.