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Finding the Fourth Proportional to 579,810.60, 869,715.90 and 280,434.60

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Solution

The fourth proportional to 579,810.60, 869,715.90 and 280,434.60 is: 420,651.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,810.60 : 869,715.90 = 280,434.60 : x
  2. Step 2: Convert to fraction form
    579,810.60/869,715.90 = 280,434.60/x
  3. Step 3: Cross multiply
    579,810.60x = 869,715.90 × 280,434.60
  4. Step 4: Simplify right side
    579,810.60x = 243,898,430,530.14
  5. Step 5: Solve for x
    x = 243,898,430,530.14/579,810.60
  6. Step 6: Final answer
    x = 420,651.90

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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.