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Finding the Fourth Proportional to 289,308.38, 434,243.16 and 139,654.13

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Solution

The fourth proportional to 289,308.38, 434,243.16 and 139,654.13 is: 209,616.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,308.38 : 434,243.16 = 139,654.13 : x
  2. Step 2: Convert to fraction form
    289,308.38/434,243.16 = 139,654.13/x
  3. Step 3: Cross multiply
    289,308.38x = 434,243.16 × 139,654.13
  4. Step 4: Simplify right side
    289,308.38x = 60,643,848,547.04
  5. Step 5: Solve for x
    x = 60,643,848,547.04/289,308.38
  6. Step 6: Final answer
    x = 209,616.64

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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.