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Finding the Fourth Proportional to 289,319.40, 433,979.10 and 76,086.90

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Solution

The fourth proportional to 289,319.40, 433,979.10 and 76,086.90 is: 114,130.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,319.40 : 433,979.10 = 76,086.90 : x
  2. Step 2: Convert to fraction form
    289,319.40/433,979.10 = 76,086.90/x
  3. Step 3: Cross multiply
    289,319.40x = 433,979.10 × 76,086.90
  4. Step 4: Simplify right side
    289,319.40x = 33,020,124,383.79
  5. Step 5: Solve for x
    x = 33,020,124,383.79/289,319.40
  6. Step 6: Final answer
    x = 114,130.35

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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.