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Finding the Fourth Proportional to 659,916.60, 989,874.90 and 423,720.60

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Solution

The fourth proportional to 659,916.60, 989,874.90 and 423,720.60 is: 635,580.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,916.60 : 989,874.90 = 423,720.60 : x
  2. Step 2: Convert to fraction form
    659,916.60/989,874.90 = 423,720.60/x
  3. Step 3: Cross multiply
    659,916.60x = 989,874.90 × 423,720.60
  4. Step 4: Simplify right side
    659,916.60x = 419,430,386,552.94
  5. Step 5: Solve for x
    x = 419,430,386,552.94/659,916.60
  6. Step 6: Final answer
    x = 635,580.90

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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.