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Finding the Fourth Proportional to 290,438.80, 435,458.40 and 148,008.40

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Solution

The fourth proportional to 290,438.80, 435,458.40 and 148,008.40 is: 221,910.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,438.80 : 435,458.40 = 148,008.40 : x
  2. Step 2: Convert to fraction form
    290,438.80/435,458.40 = 148,008.40/x
  3. Step 3: Cross multiply
    290,438.80x = 435,458.40 × 148,008.40
  4. Step 4: Simplify right side
    290,438.80x = 64,451,501,050.56
  5. Step 5: Solve for x
    x = 64,451,501,050.56/290,438.80
  6. Step 6: Final answer
    x = 221,910.78

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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.