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Finding the Fourth Proportional to 390,836.80, 586,449.60 and 154,187.20

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Solution

The fourth proportional to 390,836.80, 586,449.60 and 154,187.20 is: 231,357.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,836.80 : 586,449.60 = 154,187.20 : x
  2. Step 2: Convert to fraction form
    390,836.80/586,449.60 = 154,187.20/x
  3. Step 3: Cross multiply
    390,836.80x = 586,449.60 × 154,187.20
  4. Step 4: Simplify right side
    390,836.80x = 90,423,021,765.12
  5. Step 5: Solve for x
    x = 90,423,021,765.12/390,836.80
  6. Step 6: Final answer
    x = 231,357.49

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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.