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Finding the Fourth Proportional to 659,712.40, 989,568.60 and 431,389.60

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Solution

The fourth proportional to 659,712.40, 989,568.60 and 431,389.60 is: 647,084.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,712.40 : 989,568.60 = 431,389.60 : x
  2. Step 2: Convert to fraction form
    659,712.40/989,568.60 = 431,389.60/x
  3. Step 3: Cross multiply
    659,712.40x = 989,568.60 × 431,389.60
  4. Step 4: Simplify right side
    659,712.40x = 426,889,602,526.56
  5. Step 5: Solve for x
    x = 426,889,602,526.56/659,712.40
  6. Step 6: Final answer
    x = 647,084.40

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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.