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Finding the Fourth Proportional to 659,140.20, 988,515.90 and 259,648.20

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Solution

The fourth proportional to 659,140.20, 988,515.90 and 259,648.20 is: 389,395.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,140.20 : 988,515.90 = 259,648.20 : x
  2. Step 2: Convert to fraction form
    659,140.20/988,515.90 = 259,648.20/x
  3. Step 3: Cross multiply
    659,140.20x = 988,515.90 × 259,648.20
  4. Step 4: Simplify right side
    659,140.20x = 256,666,374,106.38
  5. Step 5: Solve for x
    x = 256,666,374,106.38/659,140.20
  6. Step 6: Final answer
    x = 389,395.72

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Double scale
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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.