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Finding the Fourth Proportional to 290,435.20, 435,069.60 and 165,630.40

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Solution

The fourth proportional to 290,435.20, 435,069.60 and 165,630.40 is: 248,113.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,435.20 : 435,069.60 = 165,630.40 : x
  2. Step 2: Convert to fraction form
    290,435.20/435,069.60 = 165,630.40/x
  3. Step 3: Cross multiply
    290,435.20x = 435,069.60 × 165,630.40
  4. Step 4: Simplify right side
    290,435.20x = 72,060,751,875.84
  5. Step 5: Solve for x
    x = 72,060,751,875.84/290,435.20
  6. Step 6: Final answer
    x = 248,113.01

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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.