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Finding the Fourth Proportional to 289,345.60, 405,636.80 and 289,345.60

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Solution

The fourth proportional to 289,345.60, 405,636.80 and 289,345.60 is: 405,636.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,345.60 : 405,636.80 = 289,345.60 : x
  2. Step 2: Convert to fraction form
    289,345.60/405,636.80 = 289,345.60/x
  3. Step 3: Cross multiply
    289,345.60x = 405,636.80 × 289,345.60
  4. Step 4: Simplify right side
    289,345.60x = 117,369,223,278.08
  5. Step 5: Solve for x
    x = 117,369,223,278.08/289,345.60
  6. Step 6: Final answer
    x = 405,636.80

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1.5x scale

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.