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Finding the Fourth Proportional to 659,476.40, 989,214.60 and 431,153.60

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Solution

The fourth proportional to 659,476.40, 989,214.60 and 431,153.60 is: 646,730.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,476.40 : 989,214.60 = 431,153.60 : x
  2. Step 2: Convert to fraction form
    659,476.40/989,214.60 = 431,153.60/x
  3. Step 3: Cross multiply
    659,476.40x = 989,214.60 × 431,153.60
  4. Step 4: Simplify right side
    659,476.40x = 426,503,435,962.56
  5. Step 5: Solve for x
    x = 426,503,435,962.56/659,476.40
  6. Step 6: Final answer
    x = 646,730.40

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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.