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Finding the Fourth Proportional to 305,430.80, 458,364.90 and 128,065.10

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Solution

The fourth proportional to 305,430.80, 458,364.90 and 128,065.10 is: 192,189.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,430.80 : 458,364.90 = 128,065.10 : x
  2. Step 2: Convert to fraction form
    305,430.80/458,364.90 = 128,065.10/x
  3. Step 3: Cross multiply
    305,430.80x = 458,364.90 × 128,065.10
  4. Step 4: Simplify right side
    305,430.80x = 58,700,546,754.99
  5. Step 5: Solve for x
    x = 58,700,546,754.99/305,430.80
  6. Step 6: Final answer
    x = 192,189.35

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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.