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Finding the Fourth Proportional to 918,129.40, 1,286,709.80 and 918,129.40

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Solution

The fourth proportional to 918,129.40, 1,286,709.80 and 918,129.40 is: 1,286,709.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,129.40 : 1,286,709.80 = 918,129.40 : x
  2. Step 2: Convert to fraction form
    918,129.40/1,286,709.80 = 918,129.40/x
  3. Step 3: Cross multiply
    918,129.40x = 1,286,709.80 × 918,129.40
  4. Step 4: Simplify right side
    918,129.40x = 1,181,366,096,648.12
  5. Step 5: Solve for x
    x = 1,181,366,096,648.12/918,129.40
  6. Step 6: Final answer
    x = 1,286,709.80

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.